Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15723a56d676e9f…

MALICIOUS

PDF

81.8 KB Created: 2021-06-07 20:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e45dd56a02d50f77b0362540f46fcb08 SHA-1: 016fca8dc3c0d70f90352fb26f80f8ddbd28b318 SHA-256: c15723a56d676e9fbecc449cb9315dba80a88fbbd456798e5ed9af64e19a2a94
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

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://chcial.ru/uplcv?utm_term=how+to+build+a+pole+dancing
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb007617dc---lesivat.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/ponux.pdf
    • http://lumieretvie.com/userfiles/file/jibuvunalixoxunibolavexej.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9417619f---73265896316.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4ed6682---fivomaletarudogux.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/8dd77040995f64e17da7daf0e350cf6d/21290541972.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092f2b8a9560---16324967811.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/27e4b1956087f1e692469ee68a50ca70/donugovokininakikolamu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba7960386---85339420522.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e0085d5cdcf07a19630704886d38519/56184130503.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4221854981---pupilanezeje.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b8df0d66---82981098891.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092690d00c53---goxulopupebogaxegi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/35bd31918adebba38130828b008ea6a2/wogujenodu.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f63cea90e0a7b081c6b5827eb4d6bbb6/wokatasowapowuniloponaz.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_off000103e0.bin
b5aa78f0642e2575113a9c547406d03eaac705f24a3d27428d3db74a611b574b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 5160 bytes
font_01_sfnt_off0001158d.bin
8e5da27b069497b9234ff9e999430158b3af5f49092a793525964838b954d694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 10692 bytes

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