Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f770a5589415302…

MALICIOUS

PDF

82.0 KB Created: 2021-05-23 05:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9642c1d3aff209209153ee25b35a0c SHA-1: 55b4e024c203490896ba4ea4df47c0ca0dd3238e SHA-256: 3f770a5589415302ff5aec75d733ce6c1beeccda7e1a31d7e2c24205ac62759c
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to educational materials, aiming to trick users into visiting these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=cours+et+exercices+de+maths+cm2+pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd1e13cf1---vowisik.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d2c1c7ce---77873458614.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e14adf14d12f46963703312e42102e88/81662553696.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/968afcf52d6b0a068bc9037c9fbf929d/lopobutotemawagopebu.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7927d2f56---xobovanowokazonibow.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d815bc55c4614a4081f0c53d014da49/91530370461.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a6a4d3d7---59552582466.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb16087ad1---suvixuloporosutat.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/27c12e664d7c965fe9e5af0857acecca/najowobifanimonisares.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607564356fb2d---tojagobukixuk.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708db22ce5b---vumadabowexorepag.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c748aeba4da7b067c23666ea9e313aa/76256617603.pdf
    • http://metabolit-plus.ru/files/file/reposowufonajebiw.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_off00010069.bin
10b87ada9620dab5567fb34feac464a61cdfffeead2ea1bfe88bbc4be5d36885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 5468 bytes
font_01_sfnt_off000112db.bin
0d04dd820f632b92f6f4dd68231f7b25a22b0559d57dea2440010f37d57b712c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 12524 bytes

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