Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a33f2d77ac8cc8…

MALICIOUS

PDF

61.2 KB Created: 2021-05-15 09:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cd4a7fc491651bd018b01ac79279cf SHA-1: 50e7e5c74c8ab193e8445fb72dd2baa4fc5832e7 SHA-256: c4a33f2d77ac8cc8fbdbb1e25819381e40fea58e0b1abbc03673cdcbad39bfef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9311

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://wastran.ru/uplcv?utm_term=bhagavad+gita+telugu+naa+song
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90c9b177a---1271928034.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cd558026---69852492505.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/4hscu973d14cc4j8025ion1fb3/85364001916.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225bbdfdfe---zowesukosaf.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0fd3ee9f---89780747091.pdf
    • http://aite-materials.com/upfiles/file/95278275798.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ccb0c450d0e9aaf5b0a210a818e51dc2/84738310811.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/009889bea89c118276599d9f2c775083/95476395904.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e808927426---noladolelolazuzolezef.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd47a6b36a---tiget.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7972272b---12411525370.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbe786abc---40472428448.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160992429268a5---42229903634.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23be5b05d---nodirapajerabimutenogeg.pdf

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