Malicious PDF — malware analysis report

Static analysis result for SHA-256 494fb3a2212ce89e…

MALICIOUS

PDF

81.8 KB Created: 2021-08-10 15:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 98fa5e1d5e8197aa365b6e0469aa8bf7 SHA-1: ccdcec90dc48fd7c3659645a4401ecd09f57c2d0 SHA-256: 494fb3a2212ce89e3dc3647f7eaa6491ee3860cdbe34441de8a12c9769f3a1be
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fffe2f3ad831d92624f56b3b3f052385/gofaxarariguxof.pdf In PDF document text
    • http://praconsulgroup.ru/pict/file/laputogugodanakudabonija.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nomupe.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/damafobifani.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b80d6e66ba068559998c7664c4c0bf85/72818158748.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc4817ee2---68631724671.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/5906632698.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/53966272924.pdfIn PDF document text
    • http://akademibt.com/resimler/files/julojinuvezumax.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/db69c79e40649c1745d20d5ad4f66513/givegezatip.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/atahfh8e56ud99iolgnkaanbg3/pawalinekotivox.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zogidiri.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160745af843cd6---toriponi.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/6202950459.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/15239985.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9ud4m10aah8atqo2gibef1dcl4/62550243956.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/48411081116.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/zedoxetadajesidak.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/wuritulege.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607189c45cf0e---18171502328.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nuvorawisafogarapif.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c087ba22b11---64616299935.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/bejefavime.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc37d06185e---76649314544.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/qsmoq41rrgq9ipapsskl9u7p77/43049737314.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/56496937632.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/bonalevovinutisor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=novela+india+una+historia+de+amor+en+espa%C3%B1ol+capitulo+1+completoPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 17256 bytes
SHA-256: 4b156388c615833e0d99b0948d7ef165219801f8e0d77c85fa6bbffd2710cbd7
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 11180 bytes
SHA-256: 7a2a7d35ce7d2790affce5719c50a9da2ab3fc3106d61aa3036dfd02711c0764
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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