Malicious PDF — malware analysis report

Static analysis result for SHA-256 1777e15872aa61eb…

MALICIOUS

PDF

41.5 KB Created: 2021-06-14 13:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9dd5b8abbc7f1bdc0c818ef629fea5c SHA-1: 138f63fce03fe9c13c70e854d1009fab1a649550 SHA-256: 1777e15872aa61eb04eaee4f517b81f3aa993842a27a2360f2cfa339182a3e7a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document appears to be an image-based lure, typical of phishing campaigns, containing numerous links to external websites, many of which are hosted on compromised WordPress installations. The primary attack pattern involves directing users to potentially malicious URLs disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 41 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=rhymes+mp4+video+free+download
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/561f7af774ed1e25f017c61a114d71fb/kuvaliki.pdf
    • http://sportgalaktik.sk/userfiles/file/27801438446.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vsbknlftv383b1m04coubr2h01/92021647201.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092899217eac---tumow.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc458679a---nakodagi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ab631b20---tixalawabolaxunepomega.pdf
    • https://contabil-fiscal.ro/mm/file/dopow.pdf
    • http://mikailang.net/userfiles/file/20210507080511_1283010476.pdf
    • http://cohensevents.com/clients/74638/File/gemaz.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e829931a93241af9b46d36b9457263e0/5896986608.pdf
    • https://contabil-fiscal.ro/mm/file/tijet.pdf
    • http://teplospectr.ru/images/files/1004629385.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4lvq948ih89asobs3m4i1ckalm/20774750307.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6bdcbbbc7---62175472210.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/for8rbum49a5j1ljjmsio8fbr7/nukimobewelo.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59994e73d2---vakepefadadexa.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v1e331oc4gbieodrkt6tqbpg52/pubevigirinewojetipiw.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/im3b61hep9vilog9qhm0i227qu/riwaloxonegikulumurexa.pdf

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