Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d8df83ce654051…

MALICIOUS

PDF

95.0 KB Created: 2021-07-03 05:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2286ff3fe6de7cfb8c51a1fe17a0a96a SHA-1: ab1c7043009e388fe1e780325cc68e7437e9a7e6 SHA-256: 86d8df83ce6540516f592c573625fa7029e9034b4619ec0f3580d174baf18bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/bhkjm7oics2br2b3qac22e2ol4/64913616741.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/038116ca8ccbac043a5b5b535249c4f6/pawunojisu.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160798cbfa6087---62351008533.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607035914e79f---votikaxej.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b6c63770d06aeaeaf40fb8cfe6336e62/30049366914.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/8399830388.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/558ecdc9445460858019965fd203aecd/tukin.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/83c83b685ebb437e565533c1fd502c56/84569953660.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/4440490702.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69f8557fc---gosenolokusebuvobuve.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3417bd284b0087c8fecc1d418f910999/wiwokevavaridezab.pdf
    • http://31kouqiang.com/userfiles/file/1624437239.pdf
    • https://liniagdanskzydowo.pl/files/82703661920.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukfski1hspeh8niab3gc9sieuj/92771455459.pdf
    • http://goodwill.pl/userfiles/file/garapunusugagofezubitag.pdf
    • http://ubestsports.com/imager/files/20210701193402.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6255c1be---kolepabefumuno.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7be4ck5qb76kpl8ildrb7ad22n/78916164663.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/938b375da7362beda8917fccfe719ae6/fiwup.pdf
    • http://allprintusa.com/admin/images/file/35592330024.pdf
    • http://augsburger-dartliga.de/uploads/file/86830973889.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608626f1cda78---kabazojopofupo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mount+and+blade+warband+tips+for+beginners
    • 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_off00010ceb.bin
60ed380e22ca4999439141649591f8ba907ec3f993d4ca37e2f48e2ef91fd044
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 18428 bytes
font_01_sfnt_off00013d3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3C 16792 bytes
font_02_sfnt_off00015553.bin
3808ed032fecfe5545b83c2665c3bbb760d15091968fea51afbc9db2f2a5056e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15553 10992 bytes