Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5cdaba71258436…

MALICIOUS

PDF

56.0 KB Created: 2021-08-08 04:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69ae4c8068d40985a8f3f941e53dd63a SHA-1: f42fae46cfccf1aa2ec88cdee64a3895d7f23ca6 SHA-256: 0a5cdaba71258436af689724f4f6bee6158a2a940b3661bc2317ce470f73883e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users through a document that, while not containing readable text itself, hosts a collection of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6236

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec2062181---puzijonimoxefixenap.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727289d2e15---69737894054.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160899bd2a92fc---61604757388.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/1284927225.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/36912061530.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e4f7ca8d---ribodopatuvibemimomutel.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/27545407334.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acd928d454d---bitojenufigubirononawaf.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/xepemagewuvoj.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/6cb87e8ce5465e6bc920efa6236980d1/fuzagufufuwutibaborobemo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/41202c8769f2311aa9c1704515a391b8/86256417591.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/90448553136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vernier+calliper+least+count+formulaPDF link annotation

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