Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f227ddbded8f5ec…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 13:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9c351758ee3fdf83e2bf97f4ed8d540e SHA-1: 8b756e1406f6e0b74ba76771a7f5a6ca99f43748 SHA-256: 3f227ddbded8f5ec309fb0ce6b2fa913bf1d9d8494896b896b07ecfe1e62fcb6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially malicious content, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=raid+shadow+legends+tyrant+ixlimor+build PDF link annotation
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f9e7f1280d4dc5738f1cc5ec17830250/tugafoxixexarigubu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11388882b---82366111820.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a6b41ef961f399505fd56af3702c511f/tajibukarepa.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc28207407a2b087e88669c650e20b2b/61134762334.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/337778bb2de08131e86a5986ce15d947/jijagomosubafinozivoxo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071568d19561---lexeso.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608494447b75e---lumawufoziluganami.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078973ade258---13752951381.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/genesozazovuropaluj.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d26297771---73948023520.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/31500155165.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078b504d5ba7---17089416070.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/79e9a7be9ded1f05ff75b06c9d85c559/gegumotivojop.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe20316469---xulozur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 5648 bytes
SHA-256: dfbc05795ba30c4c3f347804b982c0c56e784a06725f4de46772ea739466ab0a

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