Malicious PDF — malware analysis report

Static analysis result for SHA-256 c790f3918d230fb4…

MALICIOUS

PDF

87.2 KB Created: 2021-08-05 20:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 793a5bcd25c3803819ffe1e96cb46802 SHA-1: 7fa928f076dce1352630eb48b6969a30adca0f6d SHA-256: c790f3918d230fb44c890987608b66068aaed99921cce9194b9fba9bc3d0b902
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=twitter+codes+for+roblox+mega+fun+obby PDF link annotation
    • http://studiotecnicoforace.eu/userfiles/files/voduzowidax.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8999e22e8---47802978311.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffad01c62a---71498589553.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd6e4e449a---dideputisumegeporewolofi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0b0e05e961caafaa0e779eadaf18cb0d/89594453118.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54d58585b---59904013353.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949148e2db5---kepusadukuvof.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/6990656167.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4faaebbc4d1de8db5a2ad20bf9daa430/bosidotukavuv.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108bf5ac0353---64465612891.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/67997290015.pdfIn PDF document text
    • http://msiutilities.biz/documents/12133441786.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c35271c7a4---11143410155.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/57c03a84aca18dc8184942ae52c94d46/noxoritixumekise.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1m1rpodo4gqrnmqi9ln0oirch3/80015460690.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/110739efeb861caec9c84f91d164ebc1/69412257073.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/viwusojemejidovin.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/xibikemijukalagij.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/67047778638.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c14e7fba9fe1415158ff27b42d542ee/18338486502.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/mabavegoxowitigajeburotiz.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88887a0fa---48772804332.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/83096852201.pdfIn PDF document text
    • https://uangraja.com/contents//files/43970424997.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/900542533a870163376b6f2082951697/54123487420.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 11324 bytes
SHA-256: 7a962367e76154c7d008e3a3e89ceeb504e5cbb799dd2a90253fcd29ad7d0e38
font_01_sfnt_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 17316 bytes
SHA-256: bc60b4a99ba6661607efc8cf6892f5db6cd705fd7e9c2e1874d445afb17aaefe
font_02_sfnt_off00013657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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