Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff40fa2fe1cd427…

MALICIOUS

PDF

38.7 KB Created: 2021-07-14 02:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5928a0b851bb234f706fa1f6d4d6079 SHA-1: aff974d2a0b67d235292523c690b9e2ae3619aeb SHA-256: fff40fa2fe1cd4271811d0bcb26996583b86fb15ffb7ed91e441230625212961
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file utilizes a screenshot lure, a common technique for phishing or malware distribution, indicated by its small size and image-heavy content. It contains numerous external links, many pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

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://catamma.ru/uplcv?utm_term=ldc+maths+questions+and+answers PDF link annotation
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/le4lbenaoi54rebdqarcn1u0fv/zajib.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608341ce636fa---zegilurewamojuvifod.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/xatexadevagafaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef77d301d77c51a143c60c029ffa7438/wazelabafotemir.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e365c9bac---30779491730.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e081e15aa---64321228479.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/80922958591.pdfIn PDF document text
    • http://pasted-radio.de/web/files/43493425895.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/meven.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b77ed1af8---fuperojoreparutuxij.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/7065180329.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4qoo2s4gvaed6aqjhog4gbl4t0/69251028942.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c42339b9---legizogemituxewa.pdfIn PDF document text

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