Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccc991875bc7941…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 19:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be95076ff5251a4d233f499a695b2738 SHA-1: 4dc12af9fcc14088a9ce5ca65eaa77f792721fa4 SHA-256: 8ccc991875bc79415642e2f3be26e649d4577b5d2f8ba366962f9b1c5ffccf0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=order+of+things+to+do+in+minecraft
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/dowixutine.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139507fe5b50---fojopovap.pdf
    • http://etpatatietpatata.com/userfiles/files/faxapeterixadimepaw.pdf
    • http://frutapac.es/ckfinder/userfiles/files/22384889456.pdf
    • http://terredellamagnagrecia.com/userfiles/files/44676737994.pdf
    • http://stl-hk.net/userfiles/murimuvu.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/dusaboxarinaxutarexivav.pdf
    • http://skncn.com/u/files/donowopidozipenofibu.pdf
    • http://www.ondebiz.com/userfiles/file/nepuremedowugivet.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/99444063292.pdf
    • https://partnermind.cz/images/files/veborivonakusavagi.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/falaranan.pdf
    • http://denki-shonan.com/uploadsfile/majalu.pdf
    • https://alirezamirmohammadi.com/images/upload/files/23564078372.pdf
    • http://tavaszitura.eu/userfiles/files/wulilitexinitafoli.pdf
    • http://ceomit.com/fckupload/file/47163381390.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b3edd0681---18319418336.pdf
    • http://rafaelokazakov.com/file/musulemiburefobut.pdf
    • https://projetovm.com/uploads/files/65406123462.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/mirepanikawisatezab.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ph0f2i28qaiq37k4ilhetehh93/79122145833.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/jekodufewomodobusuzudatam.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140028e738d6---13669800549.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6b.bin
ab3d23721ea3fc231caf657e20cf9da28cf51c5d4d6e7ec850fb10d077aef614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6B 10900 bytes
font_01_sfnt_off0000c841.bin
702f3d950a5070d181bc1d6cbe6657cbb97f547323cc3e3449abf1e60372aa2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 17168 bytes
font_02_sfnt_off0000f306.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 16792 bytes

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