Malicious PDF — malware analysis report

Static analysis result for SHA-256 c921bff5a74f7542…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 06:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04f604ea37ff6aeaf50eb6fb20f0a847 SHA-1: 5b106276637bffde2b72413623d943f158e9c455 SHA-256: c921bff5a74f7542927815c30707b5ed61c158c669eba2f8f6d8e61a55b89f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=sample+receptionist+training+manual PDF link annotation
    • https://tranhtreo.com/images/ckeditor/files/fejosojilogal.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/djfls5t8c7n36ahrudmv1mtpnb/46159820437.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/9067312924.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/datesatox.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/47544243761.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/76459099670.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/824130276d89db8c672cb2665581a108/xixogejobelivebonotexop.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/fejiroxifetak.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/82278b6b26871db049d16ded282b5f4c/42127014723.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/236002144.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/26312828504.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b6978d24---77472089504.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217301146204828.pdfIn PDF document text
    • https://digireg.se/upload/tidifuf.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7226088bbde4ab1389e67dcb8aeddea2/fijuzodado.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/47356557137.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/6454287746.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/gadaguzonedupivuvi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/88319705190.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/xuvapodetigoloxekigufode.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/verurasixominoja.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/25562304150.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/20499873136.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 10892 bytes
SHA-256: d9451ee75e01efdc7cf563e7e20fce69c54e6a87a3f29267c28e1047d30ebf3d
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 19152 bytes
SHA-256: c47c5f179e263c18f14fa48bbde6bda21b505f1f7ee2a426f3eb6318821c1dc4
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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