Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e794e02fb1433a…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 14:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ca6ef15864c1da7bdccf7eefc26978f SHA-1: c2930eea1151db4471b8d4aa8519edbd5853e5b3 SHA-256: 43e794e02fb1433a1c311abb9ffee7876f5444f1ccc3efe98d1c3b62ad69ddf9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing 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://oniceh.ru/uplcv?utm_term=gta+3+mod+apk+data
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a744eea9176ed86b09bcf6bffffdafd9/20783217428.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160784011723dc---56318711202.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c5cd6238---67822313673.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870442dde3c---13237342059.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615a975b93---jupapovasomigurid.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46633ccb54---xokonajozoxebagovigufo.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7b5b8fc59a0f4e3d702eb44dfd97b6ae/19853575105.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0856a2dd6---dexexesasididifozatusa.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/3e6256e2b6a3ce90f844133e8908f9cf/wigerojowazitodeboruvi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d847d9298e6e0529f0e6c63d783f2afb/56847650117.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/73096252945.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7433bf494---pexobora.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3404c09821cce1ecc68fa9d2c030cf60/jawejaviko.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_off0000e9cb.bin
cd88f3ab00547b722d530130625f38169a05056b2a678613d697866ff2319529		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5060 bytes
font_01_sfnt_off0000faff.bin
1b76cf9c2f01d1a1f8e248f5fc93fcc04abf902233607a6002e7cc110a68847a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 10736 bytes

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