Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef43280a59f18e57…

MALICIOUS

PDF

108.2 KB Created: 2021-08-12 09:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b092ad91dd897eeada1f3233a1d2e630 SHA-1: fd3239f3b7ab14990cc283b1920fcbbf2a73fab4 SHA-256: ef43280a59f18e57f97da945d8b9d3442a97b157e9131eb0a6c3bc94fcb104a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9242

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://audit-advisers.com/userfiles/file/95960414604.pdf In PDF document text
    • http://mega-treid.com/userfiles/files/73757222643.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/q6is4g28on0pd4fvldr24pta3j/80421431557.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/zaviw.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/famuveneviwip.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104de79959f7---darigi.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/vokatumowopew.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/419cf4764df6024a55c05822cfbdce57/52176108694.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/13679036327.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/27991605656.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71cb00651---36239857599.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/63148291235.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/23661050625.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/18304965553.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/85696524998.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lelumebunopiba.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/9034884db35fe705d5602856ba2290e9/94446711343.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/duvuworuguxobegotufisedik.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/kozikolibiboremadaf.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/43501874096.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804e9a35b4---99874250481.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/7903923640.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717b16e5631---vowojidegomisopunarava.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/nejunanujumivasirobuzusis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=death+coming+up+the+hill+audiobookPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/83822101383.pdfIn PDF document text

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