Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20c5b59b364869d…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 09:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32e6155c593bcd495b795b41ddd4d04a SHA-1: 586c8c2baf1f531b1192a634b53f94c50164476a SHA-256: b20c5b59b364869dba7d5448052422b6177cd8c4d50c9fe00233a479211d7a01
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bagliodeimille.it/userfiles/files/lixufobonoxepopivopin.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/rezefadofeg.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080b1807d824---41558854928.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d46880e804924447274d8d404d8664da/dijigavofotuwod.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73887251047.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f54c904cdd8906de6287180a20f2f199/41273259102.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/273bfc7946c37e726e5f64e46f7600fe/61964104251.pdf
    • http://kursadowicz.pl/Upload/file/sogifegatoma.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af81afc29---45750706728.pdf
    • http://nextgt.eu/uploads/file/bodomi.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f042806a61---tafubopazodudi.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071589062ef8---muvowuriwojurik.pdf
    • http://namuvaldymas.lt/userfiles/file/62777996116.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43dd636b6---4871216771.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/562f9f0c816034311a222a436a05dc28/50737191976.pdf
    • https://airshow-bg.com/file/7760480020.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1b06215ad9840eac461d071b873b8c90/81113725806.pdf
    • http://vonschickenconcord.com/uploads/files/64440861190.pdf
    • https://havanic.com/cache/fck_files/file/96109316803.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/q9hid5b2281dctill2p4mvsd6a/wufazakojezejorud.pdf
    • https://aiaciran.org/cache/fck_files/file/59559566594.pdf
    • http://unicorn-furnitures.com/d/files/85229566388.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ejemplos+de+carbohidratos+complejos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e2.bin
0ae1e0be866573557c43e42fb40e5e481197234d5c751901f316f46d6bebbf9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10928 bytes
font_01_sfnt_off00010cde.bin
654cfb5b3d0221e78b44a16e2ede372d2e552c8f783af86ca34b095e65d8288e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 17808 bytes
font_02_sfnt_off0001398a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 16792 bytes