Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81b6f4ef2ed631e…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 03:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aeeaf9893d90abfd580735f28db966e SHA-1: f3a16d4e43f69c144312e18b26e1fe1e3c4efacd SHA-256: e81b6f4ef2ed631e193f73e11dc51b4cfd2cdd7134dab3f0f8a3e3318ae671ee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, specifically designed to harvest credentials by presenting a fake login or MFA prompt. The embedded URLs and heuristic firings strongly suggest a phishing campaign, likely using a link farm hosted on compromised WordPress sites or disposable domains to redirect users to a malicious page. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://laborke.ru/uplcv?utm_term=outlook+365+mail+server
    • http://musorcentrum.hu/files/article/file/39930468624.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c044edb44b3---97515821076.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c167d9b8a1---81736328418.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b83c95190---26037966848.pdf
    • https://wegofa.com/userfiles/file/pivajabilusoxofoguv.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7e21e1846---junagosuronagaluko.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1edc7a76947cf75b8b8665ac0e4e5166/jojifo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u9bs2terrejbq1pugo6mfcebf9/zajedinolejoz.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/64041313423.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/npkfms0nt5de5phtteh4d6i0g2/92928860941.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2bf0f6bb---kiretuz.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c07d925abfb07c3d9f748476c009ad96/dojage.pdf
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210626021622.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/mubewabuxo.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/34231232796.pdf
    • http://belhavenhighschoolalumni.com/clients/13962/File/pobesopimamupirozeva.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4867658b---xapunezurakaxibidutifu.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8da844e26---81580273119.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863dd088c8---pebazozero.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/df8ff0d82a3f95ef359064444c9f913e/92643424942.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/oljdb20tshhmud1uhn60rodap2/biduxak.pdf
    • http://ultraljud.nu/bild/files/kimupozesosavepolefarix.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p84l5hbirqism7u0vslmri9o27/wibus.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41c80bbf---66013628567.pdf
    • http://esrafisek.com/images_upload/files/33623475894.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996e4a9da4d---22296764311.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_off0000e965.bin
6389e83203e61f0b4930df16ff643dad28f949791b3e53f609625daebe6b18bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 17084 bytes
font_01_sfnt_off0001164d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 16792 bytes
font_02_sfnt_off00012e64.bin
c3cff879dd913f04813ad6997d2bfd359aed959420a0673b89ae46fd7df000ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 10924 bytes

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