Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85eb89086c53158…

MALICIOUS

PDF

82.9 KB Created: 2021-07-04 03:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d07768e5788dca75548da10729ee9e8 SHA-1: 82b115e1834b7bdc3be7592e09b61a569d2faaad SHA-256: b85eb89086c53158b29acf6cbb853182e2436e2abeb2f2d1d4ad426e2b24133f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which likely serve as redirects to malicious content. The presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inwebjor.ru/uplcv?utm_term=canon+s530d+manual
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c86591966---venivo.pdf
    • https://houstoncoinshow.org/FCKeditor/file/puwamatonaxuxu.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/55207773055.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37b8f7d5d252f341abc45cd36b2aef11/vovujodotovuwalilefevemir.pdf
    • http://www.aadhar-interior.com/userfiles/file/kefivifirawudawitu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5583615c---73639597002.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a3fc6702740d706eddd0b7c8a20838f7/pavoluxatesunixekejite.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/pizovitab.pdf
    • http://reklama-kemerovo.ru/files/files/fifopoxodukadipov.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/qccmnmgcpjn864pimlf00vls7s/wivopemuxolugojo.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/nutemumudugupamuxosobije.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/bosaravatujate.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/gebekor.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/72929693267.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e740e31f0ac3992f49da422c5a8ec70a/mujutogolopetobinafamijo.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210619175759.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf39638b---72271701932.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc6e349b0---15887734342.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceaf36bc8c---58221698466.pdf
    • http://paradisoseminatrici.it/userfiles/files/85597198337.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6c2a02cb---kosapidasevimi.pdf
    • http://jnnycc.org/userfiles/file/48397960527.pdf
    • http://retroldn.com/userfiles/file/86695118311.pdf
    • http://cuboni.com/uploadfile/hong202106221734143207.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0c869e73---15005310141.pdf
    • 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_off0000e3dd.bin
887bb6197d45c2eb54b7b66d5371a1c1281fb728f0cf60a035fd6fbc356ffda1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16464 bytes
font_01_sfnt_off00010eb4.bin
77aeff09875888da523b6318f5cd7843fb748b1cd520fd4737eef7293fcd6a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB4 10548 bytes
font_02_sfnt_off000126bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes