Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a84d4052c231398…

MALICIOUS

PDF

71.2 KB Created: 2021-06-09 07:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46ec6ff6cc6bed4216a9a99ce89012cd SHA-1: d8152d88d33dd4f5e2d9e3a0475d1fc77c391d37 SHA-256: 6a84d4052c231398e6f4a9c4e8593943eafd3ce6e2350457fa2665954305cdfa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a phishing lure, potentially leveraging T1059.007 if JavaScript was used internally to manage the redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/uplcv?utm_term=click+test+kohi
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6bd1e5985---wozazuvevuferexi.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607559d61ae46---jalipusabuzutuzubotuso.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c5ad6e---mejokexilitus.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501120811188207.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082f62e58c6e---febavabokejasodonowu.pdf
    • http://dinskayarealty.ru/media/file/94692325319.pdf
    • http://akinmedikal.com/uploads/file/83413402878.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/dae6683b638f423153c20c753c64fc8d/viradefuzawowejuwebufi.pdf
    • http://rydelko.pl/userfiles/file/zabopologeb.pdf
    • https://alternativecarrepair.com/userfiles/file/fukebokukozeja.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/248f54ffab1573babdc31ca6f41685cd/8359966866.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb97f2127c---6639813796.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ab80afc6366064e87260feaf7310f4b0/telazamepixa.pdf
    • http://championshipsportsrings.com/clients/23492/File/fusasejufaxijide.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_off0000dd9e.bin
c1b3c8c752811e2a0988989bad52c784cab0e30f91865ba7c377d035983a7b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 4552 bytes
font_01_sfnt_off0000ed18.bin
59fc58170d711e693f6e4b7979b456f2b1b5f7a622b3f32d49f0e16a4017cb01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10308 bytes

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