Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97766be756548f7…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 08:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d7324eb850d116301b90b0c225b6e8c SHA-1: 952ae9f7b898b1c05070f2b5d9be833effc28c96 SHA-256: a97766be756548f78c551aa79636a9cd93b48f87fd6a20ea8dd40c063ccee760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or serving malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=burnout+depression+and+anxiety PDF link annotation
    • http://catgarner.com/clients/873270/File/59643667625.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/rojopekufikozaf.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db884449e73---xofizajabo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd86e8c7a9---vodokedubabus.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/posufemenifapejolejuku.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/lomederilesosejazavinemil.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/2498675667.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/tazizopasowumukowiv.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/39394883648.pdfIn PDF document text
    • http://emaaravm.net/upload/files/54279194732.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d4d87f2eb---sitosigosunited.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/nasopafexi.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/844482dc9254c2f4a1f09ce16a1d498b/35865720228.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/kakutototuzasunuvuxirusoz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943dc99bc5e---xeduwejagisupimi.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/37838682622.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e018857551994bf25413e96c6c37143e/vosezibivokabutemoweronol.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8oe32a1vu0617qec7u46r1jdvh/42275429450.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3486ceb40---daroze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b3669d57---66348384254.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/55b94f258d80edb73cfba73a81bb54ef/vuzarit.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae4dba82c6---fawebapimake.pdfIn PDF document text
    • http://amdind.com/userfiles/file/17766278207.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fenozig.pdfIn PDF document text
    • https://webhosting4.net/media/file/poratonusebi.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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 16924 bytes
SHA-256: cfa840869cd464a7dcd932d19abf0b7452fc97fb901c8483b8173aaee3251e0d
font_02_sfnt_off0001382c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382C 10708 bytes
SHA-256: e4270ea61bcb4e5fc7bb6d86a59d7507d7d61807434b4efefef407fef4acd2d0

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