Malicious PDF — malware analysis report

Static analysis result for SHA-256 5201d51c3e01faa7…

MALICIOUS

PDF

93.3 KB Created: 2021-06-28 03:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cbb13f728876401d037e90bf65e4316 SHA-1: 0d0757f45e1eb26ba46242b0d2e3dc90a57b810c SHA-256: 5201d51c3e01faa77fbbd3761c3ec8dc03cdccaec1e38314dfb1e84fe647269d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to WordPress upload directories on various domains, suggesting a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown URLs and the 'link farm' heuristic point towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9cb2155e98ab6ed27e6547ec2b23b8f3/50010056996.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080e90d5108b---linulizowokopisaleto.pdf
    • http://mazdooradda.com/userfiles/file/20499007611.pdf
    • http://ampletrekking.com/userfiles/file/88594104570.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93e8e24c5---gifiled.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b68517eaa---91906200100.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80d216a63f---towowipufenavometumam.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2aa55a917---jemat.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777123688be---fitixolusonojika.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b52e0fd8003a2058b8f363116ea8c1ef/sexuxabixogobum.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0283eead2cacbe6e6e3217cbd3428067/xipig.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e32449aa---bugujebunekox.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f698291d37---basitexogefozumamajozire.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b47a84704---4316184226.pdf
    • http://syuncyoku.jp/upload/file/nokonobugukaneguvanikeba.pdf
    • http://fouladsazanco.com/Upload/file/86305740778.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kovamaxixadeven.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/22588c3c0b098c849cb0391eaa2025d6/mupobevunodafilepo.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/63b20d9ac6a9eb5f76dcbaa49d225acf/kebedajuvepelopuvasirig.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63730429925.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b850bb07f57---74404996999.pdf
    • http://lulanjina.net/upload/files/20627230675.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2iu29k40nhv770vtindg7qu5f9/sifipikedasilo.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7fabf1a6644f2b9cd0396112785e9c7d/xujaxubasuzoxajofawun.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sogejosagadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=where+can+you+get+something+notarized+near+me
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338dba3291---gevijekugataxisoberapuli.pdf
    • 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_off0001079d.bin
9a9ef439ca97ceb4dadee47e32162405f7c15dda544af3973b8a399d5e308cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 11036 bytes
font_01_sfnt_off00012106.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 16792 bytes
font_02_sfnt_off00013918.bin
9c1ad9f4161e0f3c6a14ea60c6876d6504d9033f198ea8ccbb6b74b3687a0fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 17224 bytes

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