Malicious PDF — malware analysis report

Static analysis result for SHA-256 129eabd0d979a81b…

MALICIOUS

PDF

51.6 KB Created: 2021-06-12 07:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 851e649040d5bfacac3ceaa411218323 SHA-1: f303f82e9c7621d6a09836b43e4a8bf9d1e35255 SHA-256: 129eabd0d979a81b082819dfcc85091a6135a8d3c18350f1882e5a74a6a3195d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the nature of the heuristic firings point towards an attack pattern involving luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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://smidgel.ru/uplcv?utm_term=his+secret+obsession+book+free PDF link annotation
    • http://www.advokat.com/app/webroot/img/fck/file/fesazodobutu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160863ed27e75d---dizosutumosefu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o54iefggvukrdjs5uobj10l8gb/72516216562.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mng400kunds3q04bo8o8r82mla/71262280490.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1ceaf305---wepeziziwifolunose.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/41414002605.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58abac18ee---1931236843.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a118f8b3726---mawijujiwapero.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073822551311---19316799455.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/868a646db52ca14fc6a4f4e343ca2751/50983436111.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03050a2257---sunasofusivofizigizokonib.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mtubb1tp1usmrg7bj5dtubnkfj/33268492472.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f548344---samireberudidesovolapeled.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/50647150488.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kasopetuwisepulepimet.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/869143a88b7ef1d8c022e33f55d1c3eb/57056198074.pdfIn PDF document text

Related samples 8

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