Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbdea07f59d3e92…

MALICIOUS

PDF

85.2 KB Created: 2021-08-20 06:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7932f5155667925e188efeb124a6126 SHA-1: 72e79a59565eb1b6a573247022a0a3f62ad875b1 SHA-256: 5fbdea07f59d3e92d04e281512a8aa8185f1a1c1300826ed5099142bd88f9c6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=tipos+de+codigos+en+los+elementos+de+la+comunicacion
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078144966a4c---kapulejonotabu.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e266442ab42066b75798558b93d81c5f/24750190455.pdf
    • https://tisuputih.com/contents//files/67963652634.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/20737580139.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/09b6a109d0177b4d07a470053c7686c3/82149898342.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/lifodusipinot.pdf
    • http://foodchemsino.com/d/files/wiwupavewikizizadave.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/91361582919.pdf
    • http://wojno-stal.pl/pliki/file/danukejobopujal.pdf
    • https://widerbet.pl/userfiles/file/foleliw.pdf
    • http://mxm-hosting.nl/img/editor/file/tonibojededitukedopi.pdf
    • http://bagiez.com/userfiles/file/kibeki.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3ord9on4mqcemhp2ljdv5ji0f0/77002973644.pdf
    • http://dagmar-e.de/userfiles/file/45732028830.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e06049516---94910455786.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/zararovo.pdf
    • http://gordostcrista.ru/userfiles/file/58576689169.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bebe9f0533---lopozoreluzesitadalatabul.pdf
    • http://xtra360.net/campannas/file/94906313400.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/14065100137.pdf
    • http://pinturasoltra.com/images/slider/files/fowekemomevas.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_off0000e5c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 16792 bytes
font_01_sfnt_off0000fdd9.bin
a8a046325cb8e02fd385c5c3e096064e80fa46280da5abdfc3c49708e0ddea7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 18068 bytes
font_02_sfnt_off00012bf5.bin
5a520c319c0cf8daeca089fd35478a359f3ff358eb8a8cec21f5e70da173853a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 10820 bytes

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