Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df5675781f0e850…

MALICIOUS

PDF

101.2 KB Created: 2021-06-13 14:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7d13a4645ad84e94c56a548d83a20d33 SHA-1: 3285d29f6adc734a77f7bb8b86d63730edc72f3b SHA-256: 0df5675781f0e850412a12267a5f9e83199c27a37f70094ffd028f50ca4ff8d4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body, though heavily obfuscated, contains references to 'Raven's advanced progressive matrices score interpretation' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4930

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 https://oniceh.ru/uplcv?utm_term=raven%2527s+advanced+progressive+matrices+score+interpretation PDF link annotation
    • https://nevisnews.com/userfiles/xuseguwexedipebabiriw.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952b14841---56247660416.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/temazujenu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/802d8006deebf27c687397ac1338ccda/begojimami.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/42409120696.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d449534dd---74912495264.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/255f125da2b4e2e90933003cd6ddb186/12761061371.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c401e0bfe1a---sebefuzo.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/5954204464.pdfIn PDF document text

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