Malicious PDF — malware analysis report

Static analysis result for SHA-256 92145ebfd31cac42…

MALICIOUS

PDF

80.5 KB Created: 2021-10-13 07:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d2c6d60308482171f3688944d66ca87 SHA-1: fb5dd74dd806cdbdd745f8f2be66fc0a50342f92 SHA-256: 92145ebfd31cac42987224f2a9d03cc048442967d2ec7391c92fc77ed50b11f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=sonic+as+the+flash
    • http://nghiencuuykhoa.com/uploads/userfiles/file/benuzudetujonowa.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/pizidavajakalixupami.pdf
    • http://ecolservizinettuno.com/userfiles/files/pivivux.pdf
    • https://foursservices.com/nbloom/fckuploads/file/43469908091.pdf
    • http://thegoshow.net/userfiles/file/redazupog.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a0732da86022551a3b81b758c599847d/89607561293.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/48466034146.pdf
    • http://analogsys.com/uploaded/file/18226326076164a6841d6f4.pdf
    • https://rugsinc.in/UserFiles/files/52662236637.pdf
    • http://norilskgu.ru/userfiles/file/57016973408.pdf
    • http://cee1968.com/ckfinder/userfiles/files/ziwasefifufufifudixekuw.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076cd432f4---55916319107.pdf
    • http://bandenplaats.nl/cmsimages/file/rojuvokonutivukot.pdf
    • http://katela.net/userData/board/file/60298270564.pdf
    • http://www.awakohchang.com/image/upload/File/axedidote.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/56791113655.pdf
    • http://sushimura1.com/uploads/files/jusew.pdf
    • https://autonoleggioassereto.com/file/40253721331.pdf
    • http://traiteur-ribot.fr/userfiles/file/81479782668.pdf
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/rozuwumixu.pdf
    • https://dongcohonda.com/userfiles/file/65286663068.pdf
    • http://ateliergermain.org/sites/default/files/file/duxikufala.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161456141a16a6---vezukapojifave.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/kumajawerogulilison.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_off0000cf21.bin
1dbb3edf9198ceb6f7ab4f55c51ff88834d2355f32771f0c3b6d38dad6a82d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 19968 bytes
font_01_sfnt_off00010347.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
font_02_sfnt_off00011b5e.bin
ba5efd1a6220f00e1a3841e90d06d66836f63b4f00effea76d13141189753e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 10408 bytes

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