Malicious PDF — malware analysis report

Static analysis result for SHA-256 e494becb9d350534…

MALICIOUS

PDF

70.5 KB Created: 2021-10-20 00:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 034b737d07f1ecc48bc7799ff494b6d5 SHA-1: 61b2c7a0c75f465ce474b7927515767d664194aa SHA-256: e494becb9d35053452621908260bb89d201ae457bbe5d98f5df0867ba569911f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or exploit kits. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cructi.ru/uplcv?utm_term=animal+farm+comprehension+questions+chapter+5 PDF link annotation
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lotakusosagara.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/58589897264.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/ledumanoten.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/tizefepokiganexa.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/99835481757.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/gasowiragigatexulep.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a52909633e65d248ae3bca06c06a0098/kozijemixuzapiz.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/piraluloravus.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/zevigolojibosuvojada.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tupakinin.pdfIn PDF document text
    • https://ptogel1.com/contents/files/bunudafawuxaromoxizudu.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202110190627532661.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/givajikepitobodo.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161620ff09cb2c---ravodasipotemozejexedo.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/43576099194.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/93765763855.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161573affa59b2---33585163045.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/kafikurawuxa.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/27208922837.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sopumipefomezen.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/dagukaluxegu.pdfIn PDF document text
    • http://le383.com/uploads/files/wozidak.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/wumonizirikegijepemitamus.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/dukudokawosimivolameg.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/71417286393.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/tepavitoj.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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 14548 bytes
SHA-256: d7e2477462c8c665ec8d174c24d87a5e19e8ca75a34897b05abb8c2491139c25
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 11108 bytes
SHA-256: 30235b87b3bb2456a8bc5db95a6462b1786b8452efe74084412d1f186737a5f4

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