Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29bde9137aec8f4…

MALICIOUS

PDF

89.5 KB Created: 2021-06-27 14:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b97155058db00e26fc51c87dc69585a SHA-1: ab26e9fe94da2a1aee7f2f4e0dbd9953eb972677 SHA-256: b29bde9137aec8f4f8cf7a46e1f1b244ed710024a8ddd916b45bc52df8c67b9b
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious links. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings reinforces this, indicating a pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b7b1a5f27---nezivi.pdf
    • http://kmkonsult.cz/userfiles/file/bowiwekenixupujibaguge.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04e6328fb---raton.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd96302361---gukizubeliwi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b12400c684---rilaxoruvofofomovop.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fce999c30---19099528423.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ad9b37a56da3dc091dbab6e39b48f2bb/25806599441.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca493121ac2---belegamelojitoke.pdf
    • http://zrdb-drogbud.pl/Upload/file/dapowo.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/66283542435.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fcf2af9d3393eca8d6024ddee31fc42c/pamasojit.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/67bc2b8d893d09892659f68c6f0beb33/30542648883.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/909a5773201a22db4d1e0392208a4976/1471463727.pdf
    • http://dharmapremipariwar.org/userfiles/file/55965479626.pdf
    • http://sahrugs.com/userfiles/file/finojamifojisivotazop.pdf
    • http://darienhigh69.com/clients/866565/File/53594983207.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6915b1e9---53677525008.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ud0fidsooc8b6dkoqettqal0t3/36315031350.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64018929261.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/faba9ca36a2842df2b69f8a38690b8c9/85292393461.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/46915c4aefc67599a20116c06b3233b6/vinafuwesurejopi.pdf
    • http://allaboutdowney.com/userimages/zugub.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/658f0f829c467372ae39103ba3e8a42a/17477162159.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2e864dfb---87853724563.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=candyman+lyrics+charlie+and+the+chocolate+factory
    • 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_off0000fb60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 16792 bytes
font_01_sfnt_off00011377.bin
b55463dd9fa6a4e89fc04d28863521efe679fb825428ab4b6fb244a2e4b993a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10888 bytes
font_02_sfnt_off00012c75.bin
8ca3de05153ec55d6e0359a87bc116b79388280ee2ea8436554f1d1e67370dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C75 16864 bytes

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