Malicious PDF — malware analysis report

Static analysis result for SHA-256 8173bedee3c077c7…

MALICIOUS

PDF

67.1 KB Created: 2021-06-04 23:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 899e2b2d9e3a69d27f5b9c3ed731e70a SHA-1: bfc63d0d8a06245b264464b9cfb0951ad1c8191d SHA-256: 8173bedee3c077c7032ba4dd8747fb63b13a3f8c3873737b6e1254991e3bb837
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam, leveraging the 'what kidney levels require dialysis' lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=what+kidney+levels+require+dialysis
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7sfhbsph6hm4ed1h4e6uduhamn/68412665433.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762a5ac66d6---jiranawaz.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/74279e094b02202ef43ccab88980d0c8/12576634626.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1500b51e15---60866985391.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d835cdf35f877694237a094161c59cec/jakened.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daxaxiwevavamupupepine.pdf
    • http://logistra.fr/ressource/site-image/files/jekavud.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bdf35315325b1096c8fe4d78f107e228/ditixir.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffde0e20c---bijosidagelexuguwukewa.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082346b9359e---485503770.pdf
    • http://adabaskimerkezi.com/upload/file/36212381894.pdf
    • http://aaaexpressheating.com/userfiles/file/xipezefusirinofamapedofuk.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5e5ea8be---goruwexolizigebiz.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314168b380---56834268817.pdf
    • https://africanresearchcenter.com/userfiles/file/31651285968.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2d34449e538bdad2d7ad6e1329fe4818/rogasigonaxetutomopefi.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_off0000cb85.bin
fe5def4b268bd5b18fc7bf61916ea6e24521103656bb600eb29f29c111b49d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 5280 bytes
font_01_sfnt_off0000dd85.bin
f11fd25c5f0d76fc8f2c35e097b2ad3536350f14dc61dec158214afa6a6dffe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 9936 bytes

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