Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57262e94751d36…

MALICIOUS

PDF

89.4 KB Created: 2021-09-24 12:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84753fb0b56f8404a70ebf8310ae6028 SHA-1: 89316b1a94f2077aff823bac262fc65b26927b26 SHA-256: da57262e94751d3690ba3477c1aec85ab9cbf3aa865d30aad52f350946b19649
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to mislead users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garnizone.com/userfiles/file/tevoramiririmibulivujikul.pdf
    • http://sudeoksa.com/userfiles/file/20210912085629.pdf
    • https://ducthai.vn/userfiles/file/kosumuxowu.pdf
    • https://charterboatdeliverance.com/uploads/files/pofenifawavejinapo.pdf
    • http://belniig.by/public/file/71986492178.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/1317144246.pdf
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fararesewupu.pdf
    • http://peneleos.pl/userfiles/file/78024769131.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4f349fc0---tumajivoneke.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/28d35a60d0918a14599dd36bbf355134/74593482073.pdf
    • http://slr-eyewear.com/slr/userfiles/20210915142707.pdf
    • http://chrisdepanneservices.fr/Sites/cds/files/buvolotenepelevebeg.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/53711709971.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a025c8825f---vuxixovu.pdf
    • http://nomorecpapmachine.com/userfiles/files/silomatej.pdf
    • http://breakevenpoint.pl/uploads/editor/file/29516040700.pdf
    • http://kingkady.com/uploadfile/files/24003417843.pdf
    • https://autonoleggioassereto.com/file/vezitaxejilof.pdf
    • http://oresteruggiero.com/userfiles/files/14037428577.pdf
    • https://ever-progress.dacola.com/upload/files/zazewiragerarexofa.pdf
    • http://www.anclupnapoli.it/userfiles/file/63051132899.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/jibesedusikuxepolarugegi.pdf
    • https://nomaquito-travel.com/editor-images/77303831842.pdf
    • http://assushop.com/userfiles/assushop.com/file/92467287995.pdf
    • https://kurishupally.org/userfiles/file/34224219658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=translate+japanese+web+page+to+english
    • 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_off0000f74c.bin
a511ca12c3d5b8dd8eea9fe7ed95ea897ef10a7c32f5a6c87095d2370f16df06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 18416 bytes
font_01_sfnt_off000126ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 16792 bytes
font_02_sfnt_off00013f06.bin
50c1b55fa37491a755f98b0e99b1477cfb986570e3e502b356866a72379cd3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F06 10852 bytes