Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e7ded97a039f65…

MALICIOUS

PDF

107.2 KB Created: 2021-07-16 02:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ebd1396b25a9f05cfdac16415b3f742 SHA-1: 3729974e9135b48d93db738b4bf33d20a330f010 SHA-256: 85e7ded97a039f652ef0545a60d329248fcdf2d26966cf839b9f2a775ca3232e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=adolescent+quality+of+life+questionnaire+pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f4d1a92a---53566613770.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/warubegazokalataleg.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d73c33c3e---74501571665.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa4ef5fbc1---kuxasobejitinabazitux.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e881ab9a0f858334a30b7f0bbdc806f9/80868440657.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dacrne9oljuqgv2d2rju0msl1o/gavapenelu.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/novkckmpjh5i0rj5p8mmg6kgv5/70839164493.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f288e6d25a---90084601312.pdf
    • http://njf724.com/basefile/janatalnajafcom/files/44292743642.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d853b2d1eb1---semagazemesowivezedi.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9749658868df13da8db9c0df33038a6f/80945750481.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb956886---31025585222.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c30d264672f3fa7558f39f6af8f831d8/63739329191.pdf
    • http://sacoorhealth.pt/site/upload/file/81664673322.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076241bda01e---fokepiwilowuzo.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/37353978749.pdf
    • http://cobansut.com/userfiles/file/mazewimojakefuv.pdf
    • http://www.dilipprabhavalkar.com/images/file/vewoveveferek.pdf
    • https://inverpalmas.site/aym_image/files/77463013203.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/jegazaxapikotetusumopa.pdf
    • http://the-bom.kr/upfile/files/sepenofozekogoj.pdf
    • http://limuzine.md/userfiles/file/pakifu.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/msdoo4rs8c14j1uq7oj7qjrg7m/tidarurujonedexorokin.pdf
    • http://fonnepal.org/userfiles/file/vabalev.pdf
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/17050594842.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_off00013f2f.bin
8f211ede33269de47bb87286b4cd3618e62ec77398bf49e1d86551584cd9fb3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2F 17128 bytes
font_01_sfnt_off00016c07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C07 16792 bytes
font_02_sfnt_off0001841e.bin
0a269a81f1b2a1a7fc42073217ab8add7f642c7981382faea7d4e90fbbb8d6a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1841E 10952 bytes