Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcebd2d97ba8bd33…

MALICIOUS

PDF

89.7 KB Created: 2021-07-22 06:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cba806ee43c6ca09a8393a19990234a5 SHA-1: 53d278ac5ea8c63b88b993d87b7ad8c9d0c20f11 SHA-256: bcebd2d97ba8bd33a13b624fcf0b5a237b3bcc6adbfaacc15d08861d8d995579
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and URL patterns suggest it's designed to exploit search engine optimization or user trust to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b364c36033---mabogibidelaloxagujobejat.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a030900719a---sogafek.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e918530460---72292827023.pdfIn PDF document text
    • https://kham.vn/userfiles/file/felovelujizab.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e2912215---88526967708.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/o5nogjrucp6pb60atlqts8b975/votiwew.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dd253be99f247ff95fb78fc1d239ee8e/54885331473.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/sawifije.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e89db0bf---11763396604.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3bfcc6f74c153613ab77854862fbef39/41817351005.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3148b967a0---nevojibaxe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076fcc4b48dc---pidagobekesuli.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/tanenuna.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607343608ca62---6269208142.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/64183280530.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/69dfbbaee4be96d30c5874d546507d33/kelomajujomi.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/17586313321.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b5d8020a81a1002541889d8ea82d7c35/16950210643.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725433be5b4---9103600069.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f28d9b3f---witapojatupozedomos.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/supimizoguzolejegokabejuk.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f362e3a72e---33477456774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=practice+occupational+health+and+safety+procedures+pdfPDF 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_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10932 bytes
SHA-256: 249f6483edb82a2addaa0b7389a55eb6b697f59b8f68557aca0ef65d704ed22f
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16836 bytes
SHA-256: e33277aa40ee104defe6a890f50cf3ba992e0a619cc9b73b461bad4f3f79fa21
font_02_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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