Malicious PDF — malware analysis report

Static analysis result for SHA-256 8911b85e6521f29a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 16:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84ee6bd41f04f3f1cb6304ab132fc5df SHA-1: 49377d1b9c4049db56e843d910c550e7d92a1b1b SHA-256: 8911b85e6521f29ada232ebc9584dee9cd2f699d4140784b890e759384271515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 redirect users, likely to phishing sites or malware downloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=whitehat2u+apk+download
    • http://itaxabc.com/userfiles/file/20210903000239_24520735.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/dabokiwimixubaxisafufo.pdf
    • http://timnhanhonline.vn/upload/files/88360382993.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b55023263---93320141067.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140bfa1091ab---sawofewakeduwefagulobi.pdf
    • http://thietbidienmpe.net/upload/files/tesabu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf5608819a50e7104438470d341764f7/xakud.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/6mbm5n263e8junnbv27sje445e/dufoxupa.pdf
    • http://yuha.be/_files/file/11343254282.pdf
    • http://crocepadrekolbe.it/userfiles/files/25394262777.pdf
    • https://galerieportelouise.be/userfiles/files/titazudalofos.pdf
    • https://purmoradiatoriai.lt/images/files/19479383202.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cmgsroqbn3n990ekr0fqkrbif9/14807335153.pdf
    • http://makesomenoise.hu/upload/file/88471997246.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/xixamuvopefagadusol.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/xusetes.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141b07aeb851---vetagubivajapegegiluru.pdf
    • http://sinners-party.de/media/file/86097073736.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kuvefigarepikiputulo.pdf
    • http://jowinbio.com/upload/files/202109141753032788.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fizemivogigujakifiruronel.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_off0000d6b8.bin
5bd428bfa2460f7aaaab5c015f92bfac059a64ab28f5339fc7e7678033eabbaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10612 bytes
font_01_sfnt_off0000eefe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
font_02_sfnt_off00010710.bin
ef31809b00d4e2114c14e250c62cc1b772513f3c3f6aae6fba6a10c3acb8d2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 18168 bytes

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