Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4fadc3bbfdac77…

MALICIOUS

PDF

105.8 KB Created: 2021-10-09 16:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea1a5057b358dc114878d15fcbe65f6c SHA-1: 3f4f8b3a13452fd334cb2c17ddb73d8797c953e7 SHA-256: 6f4fadc3bbfdac7740b2058b680ebb1694ec19b7de188113fc1d2ff43034f4d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=phineas+and+ferb+not+phineas+and+ferb PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e382a11a5---84434462045.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/pezofelote.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/76684125805.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/17428998078.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/59905549645.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/50540088728.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/23981047879.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/bilamudimarinimotoro.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69edd67cb3ea42d573356aca07159fd1/33226936810.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158f37032bac---firuxemubiwunujepe.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514108abe7a---47558170406.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/lulibejufigim.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615a200c24547---98743849311.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wimifaxo.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/temukosifejonaxanujewu.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/10483376432.pdfIn PDF document text
    • https://baptistfriends.org/media/zodagamujudamopiduk.pdfIn PDF document text
    • http://hrudolf.com/userfiles/69475509365.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/1301019737.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16154570650056---dodobakibenexed.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16156af776400d---50912881491.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/44152537546.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/jov1mi2ebprb0ko2bbbu0gjk8m/43532384681.pdfIn PDF document text
    • http://fnb-concepts.com/images/uploads/files/96213146682.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_off000135cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CD 10692 bytes
SHA-256: 352e17c465cf36dbb28e4e945ada52503e54f27e7c26e072eacf8944b6c93b78
font_01_sfnt_off00014dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 19884 bytes
SHA-256: 398d7187d9f5bf0ee9da2c017a44c6ab6a951eb3ca7ef4b4aaa785d095e0c546
font_02_sfnt_off00018166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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