Malicious PDF — malware analysis report

Static analysis result for SHA-256 def2083daa30f99e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-23 06:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc817dfddb42404b96e79fed9194839c SHA-1: d5af3e6a1c2ce79154ed6762399cc5852c4f2409 SHA-256: def2083daa30f99ebc7272e12928dc1b55447367bf7b58add7c3a947184d830a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=deer+hunter+2017+game+unblocked PDF link annotation
    • http://seosanhrd.com/userfiles/file/37988859628.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/dowixifowuwasozudojogug.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/70502412075.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613092e00d437---xawunigozalaxemo.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/teferaxewizoxafosujabula.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/bilefazabipegawanimanarin.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/retuvotadomizomaxidiwid.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ebe80926c83bd8a2d114f717f4e5d004/dedike.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/92277301929.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kefeduzoxixepanelanabe.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/75147775133.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/52652003909.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/ludiladaz.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kavev.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/41254581738.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/jupevaroduzek.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/43498607909.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/mewawevotolus.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8971c06ac---95048606721.pdfIn PDF document text
    • https://krusomying.com/data/file/xusoxazoli.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/busovesepode.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66093728921.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_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 17944 bytes
SHA-256: 41dea029336d17981834237d58b2f4d0cd38be730f7cfdcc59a3daf2c8ec3f81
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 11236 bytes
SHA-256: 1bd29c90524ff47394bfbdc8b5ebb198f21ddd3dec007cc401a51fab0a734653