Malicious PDF — malware analysis report

Static analysis result for SHA-256 925ad542ceb3e2c3…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 13:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4f80e5b2136df2362f7ea43aecbc9dd SHA-1: 23949986fddd2adac5798c5a56b5e41a074fc918 SHA-256: 925ad542ceb3e2c37cf6a523cf09b632cd8abaae638a361e87474530b15aef0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medtek.vn/storage/file/37836564041.pdf In PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remugitaz.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6770b6ff---wuwasodafaka.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/jusizinuvonasu.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/lozufawegusimazanokore.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/64163162818.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/38011028525.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/22075064377.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/zupozefomavetakozamesi.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090822085070.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/juzoxodemunuli.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/judedemipoxux.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45150e7aa3e9b939730270fc649f36bb/tofilerebizabi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cd3d713e---jodedizimulupekif.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7500d2019---lowigivodewitukuxojize.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/muwezulaxulavitowirokuvud.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/lavezexev.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1cef482b9c862a0eab87962b5982e9b3/59272827413.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83b16e8414441d55b2d2c5dc8b90aec3/88768428719.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/14514512464.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/rusisomukuxedarinidup.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/85607181237.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/lopanasosozasokulezanu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf173f14f3---vaxamagasudefaxome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=nfs+underground+for+androidPDF link annotation
    • 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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 15016 bytes
SHA-256: bbf17d1ecf1a50813874bbae59a28a857405d0693c8f7d74408abd0d33e48baa
font_02_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10464 bytes
SHA-256: 1533a5d1be7acd74ad1cb8c73f5e723ffaaf854d5d15f66754135a8342eb1532

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