Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd2d03085499c17…

MALICIOUS

PDF

39.0 KB Created: 2021-09-07 17:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e17c60de96deac0dfcc175e2bdf33c2f SHA-1: a7578f7823643a5751476213b5902c497eff4085 SHA-256: efd2d03085499c17de56a18889f8996ae39eee1d65dd48d84c72506bc013ed4e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mantyobras.com/userfiles/file/zevojovibudiz.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c15ee5e1---pukenuzimirawekikeja.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/69790905440.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/50203137291.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cc0ff052ddf599df689d7e271159cca1/ludumadulerovawimozalulew.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c9b2d6a8cb1a64585b6258e9be7505ea/zabivivutofoposuw.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/nanamafatowulogebaramowo.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/waravisin.pdfIn PDF document text
    • https://istanajp2.com/contents//files/11593753188.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5aa439538fb07aea286e8f265928ed60/20867478779.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/gabikogaserepopuvod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116e5bc3b7ed---68673167406.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/6460992851.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c728ff2dbc9---retemedebekuxexodutuzug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/fileIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stop+eating+your+heart+out+pdfPDF link annotation

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