Malicious PDF — malware analysis report

Static analysis result for SHA-256 90741ff9f0f230b8…

MALICIOUS

PDF

69.8 KB Created: 2021-06-07 18:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c403b4697f3b12d85b41dab84cf71942 SHA-1: 10e20cb7b9ad12ee34e6ad16f6f3daa25355f4e0 SHA-256: 90741ff9f0f230b8eac7dd9bd348a1adf0ed60c069cb570bf831eac9e0c83a4c
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 sites, suggesting 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. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attempt.

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://chcial.ru/uplcv?utm_term=months+of+the+year+worksheet+for+kinder PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/8d0e1fcb11fd2fb5e344a607fe96e4a3/24525321609.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/30841850362.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/2273d4041ddaf0a1e8a0e80200cda9b5/5979676588.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609843894862b---dawiluzitewasapipa.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/97117507058.pdfIn PDF document text
    • http://sam-global.ch/files/file/sumubiwefiloposofuvefoz.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/91138005529.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rqdnnvdqa863bj4nal0jue23/favejud.pdfIn PDF document text
    • http://ahchala.com/img/file/xudikukazubikamiwos.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0af80176---gujaxixanefi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sj6slincikf7q69f2u2pia8mh4/pexolowujale.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e60545a666bc5a76abbe6a48dd415cd8/xetisegutijigez.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14a056f4d---98843977487.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/54964189166.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 5224 bytes
SHA-256: 476ed9088fe7876633eaad45c5f717b8d06730d632eee56a1d490c729191b2dc
font_01_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 10592 bytes
SHA-256: d1861c4496be633d803d37484955b5b8cdffb022f9610c8d5694ccef992a7492

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