Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f73df6018eb87ba…

MALICIOUS

PDF

83.2 KB Created: 2021-06-25 12:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbcfcf4a4c3a044aee071a8dfa3b793d SHA-1: 7a1d9bdd304f2a4ef8116eeaa5f216fb0e9c258f SHA-256: 6f73df6018eb87ba55ae00605116161dae7114eb9d939be159ffef1a5f429bca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=agave+syrup+fructose
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160909e89a0bf4---57003483986.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ugr0ihv03uq0638c6dnorc8fv1/lerotekapunubivodiko.pdf
    • https://my-natural-style.net/upload/files/57909680849.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bk67phh5vss1dc9v8385on9skl/54044640905.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a577c91---77009149943.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530869f525---36629077799.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/355c42a04aead2f8c2d32eb09e8c6093/jaduzelatamejozobugaxeze.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f104a00c---kobagutetup.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c84dd1a7---sapujoderiva.pdf
    • http://billedbutikken.dk/articlefiles/file/marijo.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c226131501---widigutezupejonugo.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf72decd56---43692118509.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/420774e6f6ab6f81b13c361f00a4bf26/74534994408.pdf
    • http://archimax.ch/dynamic-images/cms/file/92640179585.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4f08e604---tiwikenod.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 16792 bytes
font_01_sfnt_off0000fb7b.bin
b8e95658c487a85da0b29e4421773daf995661dee10de23193fdf19f50550a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 10676 bytes
font_02_sfnt_off00011431.bin
3be4cd15dabe959439d864a756351535e8de5a18e9871a40ed950b1f63c30e8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 17084 bytes

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