Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e2d25e7c91900b…

MALICIOUS

PDF

115.5 KB Created: 2021-09-08 01:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 484d2a8cd3f5372aaa1078d9f4776454 SHA-1: 3cd9a942f11b1c679b9f387db723ea5a1cd94285 SHA-256: 83e2d25e7c91900b9d6b79c3ed9f6f7368a488995bc23a3547d2a4b3a2e2a402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims through deceptive means, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://oniceh.ru/uplcv?utm_term=pavel+tsatsouline+easy+strength+pdf PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ffbfcbc4551---vurebegijokafunirobo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb8dc4a56---poxidaluxezopajeto.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5746ebfb47---52900622026.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/13895222717.pdfIn PDF document text
    • http://veitali.com/upload/files/sekewizenifutom.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d59641bf---22970698409.pdfIn PDF document text
    • http://abnicum.ru/files/file/47243459733.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077a46f05bd7---dezimixetulovafinurokew.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/57499070174.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/f4lio0nn095289ijrlt34bvql2/lavanagokog.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7176460b303fbddfda82d4f1d8c5baff/70631991517.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072144352e86---75434692184.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/dosivinar.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/brloioqjei9hp5ndbn0fi8t4o6/zejud.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/dexokibafajaz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff773fb283e---tokevew.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210809074938.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202108file/2021080522544770554.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/2383105914.pdfIn PDF document text
    • https://plasy.com/uploads/file/89454350327.pdfIn PDF document text
    • http://clingac.com/d/files/nuwefopojitujibopeni.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613695cfa766c---bikurenakoguwiv.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7ebea363---gosojulanub.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/satafopoke.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/73806536782.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_off00015be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000173fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FB 19972 bytes
SHA-256: a5729052625657ec6a84f8707dba422292656427cb8827062d4ae947a4fccbc7
font_02_sfnt_off0001a686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A686 11060 bytes
SHA-256: 3809ba9449a86a37a7ccae139465b136c933bcd9c3a6e784b4f89abd22825da4