Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d646a918e64280e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 07:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96f3775513063ad687e3f01df96b4a4a SHA-1: 2487a1b196afb1701df25bc67c6024ee7477d92b SHA-256: 7d646a918e64280e0d0373b8418b4c17edb868dc3e99c5f559535daa0ea89ff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://catamma.ru/uplcv?utm_term=objective+proficiency+with+answers+pdf+download PDF link annotation
    • http://ijpdua.com/contents//files/75626821928.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a284c936b63---32339160573.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/sogifuvuwunaru.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/foxaboxogegafowexu.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/91555719986.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zufularuwaxuxijanojepa.pdfIn PDF document text
    • http://futboltotal.net/images/files/24176783201.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/37702234170.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f682ec4878---71683119754.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/7384807428.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/13e09a04be094453edf531a97a4f296c/nosameloxokosewegeminufa.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/36150284987.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/musosabupapozojololuvaxuj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8540d99fd---17839570843.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/negiw.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7047af3532796e3a025d38780c58183d/wojilegerepixuwazadifijek.pdfIn PDF document text
    • http://armanetti.com/images/20603485845.pdfIn PDF document text
    • http://nakatka.com/files/file/jokusufitazudinasepuwewez.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/gokunupezozumonekafapo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905bf6efe3f---nuvuferu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50714466307.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bb71d7cfe9a6c12c650cd7908019fe1f/fapipizelikalusawitima.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41268991611.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3c77d916---wiwozolofedesujepuwup.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/c1lnlph6a7hpm2u257qh1c9nr7/fasido.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/wivipezawe.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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 16004 bytes
SHA-256: 2875fe21507680140ea1951e1e02a90dfdb6e7f262849b5d34d3361c0a5cd2c2
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 11280 bytes
SHA-256: 336ad8181fa9b1233b0dc7997b9f47c3944ba06f3db1f581a6c2b5ced53bbcac

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