Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bae78c26d90769…

MALICIOUS

PDF

68.0 KB Created: 2021-06-17 15:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be3456f3b400c1991298f05b9648fd38 SHA-1: 131086c3fcf384607e3df8e196503b743c3da9d8 SHA-256: f2bae78c26d90769a0ec0c41278384b79e6c039152f2545c262b1ea5de8d1147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/uplcv?utm_term=pacman+game+play+online+for+free+classic
    • http://bafiti.com/sklep/userfiles/file/fogesexuziv.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5a3e0f8df---dosumitegesabunomaj.pdf
    • http://gabortech.comadmin/file/85156042742.pdf
    • https://amd-export.com/site/upload/file/15391085380.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/338ejbrl7r9jfurdltlsbl23fq/68221607319.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f340457a14---16743548071.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ketua9kk541ocganasdp2tqv86/66132792726.pdf
    • http://wintec-samu.hu/uploads/files/69675021714.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc333c5bf---40594532973.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608629ee57442---mujovexoxamimab.pdf
    • http://mextro.de/upload/files/6274516196.pdf
    • https://transport-vehicules.fr/userfiles/file/16074135300.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f697824e3---regora.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/11b11028aed7a42d9b98cb038fbc5b61/83185714148.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb73.bin
83bdaff507e46a2239ca68accfec08e0853b5da21f7f76f0e8499a2b6e03382d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 5440 bytes
font_01_sfnt_off0000dded.bin
4065b73502103559aca6898686876e0d75f9f6c6faddf01887c462a71b47095c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10860 bytes

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