Malicious PDF — malware analysis report

Static analysis result for SHA-256 67afa41479aaba99…

MALICIOUS

PDF

73.1 KB Created: 2021-06-08 08:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6116558326a0537c7686f17f70f7f589 SHA-1: f408333e7a22dff062be5dd2ddcc8cde5561d350 SHA-256: 67afa41479aaba99db74bde55995aa830fee1a4be580b19bb9363fcd5077105e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=commercial+electrical+load+calculation+software', are likely used to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent.

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://infrive.ru/uplcv?utm_term=commercial+electrical+load+calculation+software
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851346c318f---kowiwofopametadizigij.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3d04e85a---9031307232.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/olm9sthvqf83t6epofk2klqj53/90911270823.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93eabaf34---jonupekomalolo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d32b0d101998fb8880dc728784bf2dd1/17707740987.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160829be244603---43318661191.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/cfdd74695a901d477198bbb508360a33/sajexivimi.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8c2657d6012bd37e3a91e085aaa9335d/81603563604.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607beddceb346---titazuxazuweluxewob.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5196a853945a549c273a9f61ccf6ac36/zovasizosuvaderasoret.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/26767865e9a10844856e08bf2cfcc63f/mekilan.pdf
    • http://www.ecostroyservis.ru/File/63119703154.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae39a94a417---femudukederibuj.pdf
    • https://aulacvn.com/upload/fck/file/11313892705.pdf
    • http://jarosi.hu/files/file/depepaxeribupakoba.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de6279270---dutupibipupenupemu.pdf
    • https://ilmercatinosottocasa.com/file/81794327687.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_off0000e327.bin
477fca1d455e817e31c9d40471060f96cb02b0dd11dc00045c26ad5610dc00f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5164 bytes
font_01_sfnt_off0000f4a9.bin
6dae64e9edc0011485dd6bae670c843fcd04f4e22606a1ba543ffba0863d8c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 10004 bytes

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