Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2f06fd42d5a6c7…

MALICIOUS

PDF

70.2 KB Created: 2021-06-05 15:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ccae777ad4dd0f04260302990c24322 SHA-1: 248e847774bb3cb161809efe8bb4d702021862c1 SHA-256: 7f2f06fd42d5a6c7c866985106c3132b0ca84f9e1cdb8fc0f5ad8960b4b8e4d0
156 Risk Score

Malware Insights

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

The PDF file contains multiple links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to exploit user trust by appearing as a legitimate financial document.

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://cructi.ru/uplcv?utm_term=how+to+do+a+personal+balance+sheet
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/1300ad629629b0dcca2c81733c3626d0/43642418369.pdf
    • http://maychamsocda.vn/images/userfiles/file/80430991177.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tk1rt1sj7tpd3pjk015bdmi2kn/93267262892.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5974c0d897f36c6c699fae055f827741/kejoza.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/67d093dd0bf6786931ff1bfda812c032/ridujawuzibi.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/va68bbkfm71nq0rhdk685mheh6/kufaximazodumedumivam.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ece7366943d27ab11a29fdfd17c03606/93514159824.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/35b973bb7d849ec7b145bd4de28cfd19/jipeza.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085460195d15---supurozojabak.pdf
    • https://amd-export.com/site/upload/file/vebibugawepol.pdf
    • https://africanresearchcenter.com/userfiles/file/47753526301.pdf
    • http://prinsart.ro/uploads/files/49354914923.pdf
    • http://amon-syotengai.com/userfiles/file/vuzowewitapiguzalixowunus.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/99cdcf017ad5e664d6afdd5baa8e4bee/tekotokobup.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/97534031381.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_off0000d465.bin
e017abc5d1b8a95dd5fdc22112db07e02db90fed1f829b2a077645a4e80be35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 5356 bytes
font_01_sfnt_off0000e696.bin
0fd22b76105d98c02b5ec661c227d6ca8008d5e100713f94998f9544ce314ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 11480 bytes

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