Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17caf61dbca0e67…

MALICIOUS

PDF

40.7 KB Created: 2021-06-24 19:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f4fc2c54b559ec0c58e937747b35f39 SHA-1: a929cda6bf7d9aa035b5748eeb8cd3910a274f38 SHA-256: a17caf61dbca0e671b3cd07ac26fc8f8f8769afbee4681fe93581088043375a2
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 0.8368

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 40 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://krisoc.ru/uplcv?utm_term=bliss+os+x64+download PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1570563841607b7964fe9cdf643e5e98/97462010780.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dde7d9e8ed3b5fd35768c13f45ab904c/vunamezokanovisof.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6116ab92dd---62477698288.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/8b8cb07701718de4d22ad203d8761182/52131877993.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/99236130101.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a91241d4---66171004731.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f7da984---lovulox.pdfIn PDF document text
    • http://bronia.org/userfiles/file/19418609210.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f37ba0c9072851a1c223fb208f5e71af/23849421278.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b406b68c12e---lokijovagolipotanotip.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/88230615588.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c533d45e4---70019956445.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e6e72d65f4de5aefe20e60a880b21bb/komugokujofe.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kk95i7mk0j6u1giuskhrkpfb05/28935499981.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/batilobekolewufi.pdfIn PDF document text

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