Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe33235519b6092…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 01:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7a3efdf3e7ebbfcb487eb6a34fa5c9c2 SHA-1: e2e4306ad7aeec871dd268afbd32238b31c90e5b SHA-256: 8fe33235519b6092af9636f17296e4f291807bfc2be4243288e8cfcb34ca872b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/74670546942.pdf In PDF document text
    • https://cecprint.com/images/file/wiwuzeluminope.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2956887ba0---41493944748.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609196d2851d9---jupemuduzevigobo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abb893b5f04---kekepewibazosovem.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/93827235949.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/48a23550fc5a36214f1ab051d9633014/vopevetidanupubisipebe.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/67996533387.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f7c58a57---53545190255.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16077018ed78a8---setakebovov.pdfIn PDF document text
    • https://faceless.me/userfiles/files/numazevunadopexu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8c035ab9caccb1f85b8693a48c120aec/92968324639.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/q1qm33qoi43o2odn87pq4vumph/51358866817.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/36375076d4f1e849feca254cbae6383d/85357272382.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/50231800629.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zixuwozowabuwa.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/21824887378.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/3187919237.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mgp7v22k6ef83udvp6f2m31dkc/xonidabuduwuvoposixo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zigetilupujibezux.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13c6145c1---fivupepiwopaxajaku.pdfIn PDF document text
    • http://ubest.ru/images/file/37261400249.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cdae8fd7---63620959027.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b75fe6eb5---lasuxurigebanazixetemewim.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba3e21ff4---4298860038.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608592e2ea5c9---tagisek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=living+organisms+in+an+ecosystem+are+calledPDF 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_off00010bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 16524 bytes
SHA-256: c8b29adc3496800df532e5ffe834d47c8621e0587dbbb04e9f5369e00e51ce70
font_01_sfnt_off000136b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B4 10852 bytes
SHA-256: e8c4caf482caf0b29eab1939a73f9f0e26ff83421c093a16f919ece8779debee
font_02_sfnt_off00014f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1