Malicious PDF — malware analysis report

Static analysis result for SHA-256 545c5607b112777e…

MALICIOUS

PDF

92.9 KB Created: 2021-09-24 02:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2f4c28198398a0d127573302327b5c0 SHA-1: e67acf8bc75020ed3eae420b3420d0bdded01540 SHA-256: 545c5607b112777e353b6dfd085fae33f46e17e971d8aa83bc9e1b31aac63276
154 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6828

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=spider+man+far+from+home+is+after+endgame PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd30df3a97---goketiturevasate.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4d543013---rebivofibenug.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jikimawatavebozegupiw.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/34126785241.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/54731624047.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/gidedojowufo.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/18174890530.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/molegemixupurapel.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/mavutamudopotumopixupasi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c1433c524---82011578594.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/29950788423.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wumibodonibadometobabew.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/6898627232.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/24036699600.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60558223674.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/parajevakavatemadim.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/momusigelebijirux.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/98289029f7ff5c1f6ff3fd813e49fcaa/wubifevif.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/7386893258.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c3926c8e---33914443823.pdfIn PDF document text

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