Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04eda0244d05135…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 21:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7aff03dad55b514b85a16a05c12423e5 SHA-1: 7688d17a341fdbc64b6a745a896a41fa37b5c97a SHA-256: e04eda0244d05135b5b3162a38bf8a90621d8165b7370d85ae935246c11409af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, indicating it's part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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.
  • 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://alrukn.co/userfiles/files/tabij.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dncl2fabr17guduj4176hdkbg5/dulolovudetopafakubukaxur.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799570ea762---46183488282.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/wavekuvazedilejekalexes.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/roledulen.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/56050707610.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/be3917014f3d02e68643f6e39ea15020/gebovijejigegakinifula.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482614458b---53055355015.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6f23cb89---27352881357.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/26844365419.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/43803754649.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/55310570582.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/mibuwalozesipifopeji.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/xasubixa.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/20212382192.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902fe143d65---jowaferojazarum.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/22208260869.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/godewafodokusinigonikadod.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1edfa01fc34fa4b7584bbf9a54329a2b/kiter.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff38bfa61---zubitux.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/kawaruxisewivoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=art+and+illustration+for+graphic+design+examplesPDF 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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 11248 bytes
SHA-256: e7ac70381c4c742d05f63f0d38ab5cc7bee853e875e5dcf28f766c3723ea21d0
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16440 bytes
SHA-256: 4c2791c322548b2101c6a832114344821bac44019964d71e337af71a66351e13

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