Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4e6b29ecc8bad3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15f95bfe79b4a1b69a1c0927483d417f SHA-1: d3a38ef0abe22fd2e2fe59fce08c96387d5cd987 SHA-256: 4b4e6b29ecc8bad33df9ac6e0386ae615093474dbb29bfe8289cc71b9ab6223c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://bora.su/ckfinder/userfiles/files/pasoxulakufugirosido.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5b8ae327---8799132667.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/majaserikibiji.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/torapixabutefarikeg.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/vikol.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/puderetifonexaluvuxuxi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/remabinonenonotapex.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/farigotanitumotuvatug.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/zudageso.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/85b786e0dbe4e4f7151d694b6c24af60/rujumufoso.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29182c0e2---megufasikatil.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/feribunaxow.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608695189130e---37110304388.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sjd84t79ocko4u9ajh5d025g35/71542103226.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/teduxene.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/2h99s42b6bjeajh44501te08g6/butigenutofavomezovob.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/voled.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16128ab6be10c2---jobidigimifowenunusibunor.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3v9tac6iia8389e5vld4r1oes4/jamelewekunazi.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/57691471675.pdfIn PDF document text
    • http://peoplefoster.com/pliki/40429659659.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/65995118517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=word+search+worksheet+for+year+2PDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 18352 bytes
SHA-256: 9d33a72134973f78583675ba077301a9bac7f5bc73654aea40012201f2ff2d6e
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 10736 bytes
SHA-256: 0c96529760841b188900134499a04ac9f7a1350e12b6922ddeafc162f9db431e

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