Malicious PDF — malware analysis report

Static analysis result for SHA-256 421ea216681f011b…

MALICIOUS

PDF

52.6 KB Created: 2021-05-27 09:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4eb4412c38e2c3c9078f47370463e005 SHA-1: 9855ddf5b55296d47db0e58c9b52f1ab02184dc7 SHA-256: 421ea216681f011b1877437da0dc62837a00f7b60c39a10bda92c856aaf55329
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The document body, though truncated, suggests a lure related to game cheats, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

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://krisoc.ru/uplcv?utm_term=total+war+shogun+2+cheat+engine+food PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/309500f239a6b7517b8ce88cecb4af61/32783665925.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081108296b9e---55270183517.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/74015547521.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/kejatezolenegonisaribi.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/66774841142.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/444351f3751d65c9d57a602bc461d922/64304923354.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c8195b4---gajumanifekifuzemo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7cbe35256d3b7aa2150cf7d1256bd44f/zevanibu.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/22118727307.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79ed30325---gupupoko.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35c2ed8d3---jowaminuroze.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/drhhe7jucf35v08hghu8f3khi0/sakaletaguwobejovofavap.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b1dd19f1c---77329412632.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/655c835c0fb748d106bc1696144ef9af/zugosebonetofamolirow.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/86327238224.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d033577f---rafuwikipuwodorilibokifi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/vavugirisemarodatizuwidub.pdfIn PDF document text

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