Malicious PDF — malware analysis report

Static analysis result for SHA-256 35351773083f5bb9…

MALICIOUS

PDF

78.1 KB Created: 2021-06-10 07:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5923c082c284b757929312cfbd465990 SHA-1: a4a504f077dc2547ed9dd093601cfb28a8705c38 SHA-256: 35351773083f5bb98f6bd6c4a8312f3775338af902cde9387ca1e6ead960494f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, many of which host other PDF files. One prominent URL, 'https://queure.ru/uplcv?utm_term=download+breath+of+the+wild+pc', suggests a lure for downloading game-related content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=download+breath+of+the+wild+pc
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e46amun7rh0m4u2fnpemu0skq6/73319283767.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8ffdc32f---xojerelase.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fb9d2d32123926c3331fd90d6a600a5/86355056352.pdf
    • https://sbufficio.it/file/68006760632.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7tkm42mvio7cct23gbqkv41ids/43214023896.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/31b3b267152ab61a245305f15c5a436c/13373497966.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/97fbbaf830a26a9516b3eafedb620751/43044415347.pdf
    • https://meganimal.pt/site/upload/file/dumudisobagek.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ch3q042vgv79vrcskq0cjttun3/29687863029.pdf
    • https://aimara-bg.com/userfiles/file/11399892774.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9319265260---8298914330.pdf
    • http://akcjonariusz.com/UserFiles/file/begubetijud.pdf
    • http://kubabus.cz/novy-web/upload/file/96276866738.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2543dfd7df871ee80bfe09b9e66778d6/81789405386.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nekinaturabuxegisos.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608da48e1278f---5284927097.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_off0000e37c.bin
3508f14c3c5c95104a37863e82adf6d8568ab24fe39c6e1ab9cc3679c1b2a87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5296 bytes
font_01_sfnt_off0000f58e.bin
f8f948adffb2bd81e32f9f37727aa4a44e5ef76aa3865729ec3bde277fd12047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16944 bytes

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