Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c4e3f92998594d…

MALICIOUS

PDF

75.1 KB Created: 2021-10-07 05:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35a45b8d42cc96b2b0a0b492770e05b4 SHA-1: b7941f10a5e154f7d472d4e5891d5659a99a9c89 SHA-256: 42c4e3f92998594d44dbad5d832d7f8c8669043ed93fc49fa7de0f3d1184b4ca
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

This PDF contains an embedded script that references 'Powershell in a month of lunches', suggesting an intent to trick the user into executing PowerShell commands. The PDF also utilizes SEO poisoning and compromised hosting to distribute itself, indicated by the numerous links to potentially malicious PDFs on various domains. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/08b94e80a70cdc98f697715463cdb747/vexapixalisewuwarajoxus.pdf In PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/sivavimifet.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/57690502919.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/58271960411.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210920_A19077B612A6E50B.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/46300094214.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/81506274763.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/87146775896.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/93102606527.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/bozibupapekivotan.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e28efee5c0f50e3148cc4dd01ee7d56e/32108462733.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/wapetinirosedimaw.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/dakaganuzewikedim.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nosefofadifojozuw.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/nedozatevufudebivipa.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/71856998562.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109120943299418.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/dawarowevu.pdfIn PDF document text
    • http://metapolar.hu/tmp/nemiwojaworufinegawageg.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/gugejefuraruxofarawe.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/bodezol.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/96537652942.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/inhn90s6f84bfcavbl6b64g2b2/ruporasovonapiti.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/mopowuraromuxebezaji.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/romisigobipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=powershell+in+a+month+of+lunches+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000126bc.bin pdf-embedded-script PDF raw stream script payload at offset 0x126BC 1648 bytes
SHA-256: a57b1a029e64d80e6ca2cf955523c728f2b624d91411d4885ad97f7ae45e5805
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='ImageMagick'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>

 <rdf:Description rdf:about=''
  xmlns:dc='http://purl.org/dc/elements/1.1/'
  dc:format='application/pdf'>
  <dc:creator>
   <rdf:Seq>
    <rdf:li>Medisa Tikoxuyi</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Powershell in a month of lunches pdf. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Powershell in a month of lunches epub. Powershell in a month of lunches youtube. Pow</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Powershell in a month of lunches pdf. &lt;br&gt;&lt;center&gt;&lt;h2&gt;Powershell in a month of lunches epub. Powershell in a month of lunches youtube. Pow</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Powershell in a month of lunches pdf</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:pdf='http://ns.adobe.com/pdf/1.3/'
  pdf:Producer='ImageMagick'/>

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-04-07T19:05:13'
  xmp:CreatorTool='ImageMagick'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='58ee5752-c9a3-403d-95f5-c75c1306ec71'
  xmpMM:InstanceID='254fa540-3046-4a32-80d6-6d2d7c84c721'/>

 <rdf:Description rdf:about=''
  xmlns:xmpRights='http://ns.adobe.com/xap/1.0/rights/'
  xmpRights:Marked='True'/>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>
font_00_sfnt_off0000c3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AA 11072 bytes
SHA-256: 12ce5deac8f5854021629a83aa8c61dd4579b69a44063a780c75e83653cdc56b
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 15860 bytes
SHA-256: 7ca23e9c0c2cf0ac27d2ddcc8cfb030b18b6bfcbb46950dd456182c237c9bb9b
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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