Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5150672fa1214e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 01:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4bf0825bd34097d7df3531f5bc2effde SHA-1: 451fb582ebfaf183aff5a1ec41e32024d850d826 SHA-256: bf5150672fa1214eb72f33ea192fb8d0a10978913612c239d9ba8665e685a458
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick the user into downloading further malware or revealing credentials. While no scripts were explicitly extracted, the document's structure and URL patterns are consistent with a phishing campaign that may leverage embedded JavaScript or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=draw+over+other+apps+android+permission PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614512b9a7975---mudok.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130591074a40---28460259653.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zuworele.pdfIn PDF document text
    • http://intertribo.sk/files/gobexezofusididemuwexor.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7384df9ed6d45a403d47b5e6bba09e8c/95043393936.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/libiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6e19f6b8---muvatomap.pdfIn PDF document text
    • http://keacg.com/upload/files/99129786094.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/2892454884.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/wubisati.pdfIn PDF document text
    • http://idcla.net/upload/files/fujesedesutunon.pdfIn PDF document text
    • https://ntc-container.com/upload/files/34870809267.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/zoxefe.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-6/20210906101111511631.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/91590056702.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/lobotikuxokesagezipigus.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318beceb5e7---garutevawagekawew.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/kisekudexupiwafiwimon.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/mopomokobipojab.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kukogekalenesusurot.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/63591877165.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/459959936.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/1422249660.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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 10764 bytes
SHA-256: 87fe2f4aa3f63a9bbdb885e5dc686d2922e3bcaed0118f14eced4af1fd0a8404
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 16980 bytes
SHA-256: 6b0ac5645fa37a7c89f1fb1ac701863ea2782e2bd6c6c768900deb644206f821
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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