Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cce86446ddb87ab…

MALICIOUS

PDF

90.3 KB Created: 2021-05-22 23:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d0db23a2bfadb4a85c7cb6ee1bebc3 SHA-1: 04cd1f80b15761e3d67f86eca19fd60b5009acd7 SHA-256: 3cce86446ddb87ab10fbc1601c0865f120c7f0ab9396f5e6b5451b7f56587a85
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 high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

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://artbynela.com/uploads/file/79184047894.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vnf2ur97cerut8utnndqcon26u/52974978597.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/bf85c1e59779bd88c32892fd23289738/3643688887.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609434f510a5c---19063650850.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f57bee3e0450254be0349dcad7c2f956/12664248653.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/uh7jrjqivn7surmcplktaj48ro/47002550622.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fd7e16e3b772555588767ba35dc4e2e2/tuzifekolinarelum.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/bimivuvateromo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/40865e4n3pp09j7s7sumsdh4jn/91031779330.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/9430f1c19fd697539bb5d18e6cd99c79/jakejugimazuz.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609039bcc1cad---9174060198.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/9ci9ovu42ephftt2cl5cjc63v9/dusigafapuxaruredegabad.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa370b99e5---xerifulerokamelikur.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe6975c45b---11424687205.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837c4b5f6f---54331497308.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3e21753b9f3fbab70a06907612f3dffb/kediwelox.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64567e64---8223184530.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=penutupan+siklus+akuntansi+perusahaan+jasa+ppt
    • 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_off0001257a.bin
d59418ab9c52b8f9a3b31cd59d04f6cd1e6daf9d11750b8a1e3fe818d9413ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1257A 5048 bytes
font_01_sfnt_off000136a1.bin
92096de48252f5244146bb445b70618f83bc4fef2272f4f06440944c08635416
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A1 10952 bytes