Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbf4b7a681f4269…

MALICIOUS

PDF

87.5 KB Created: 2021-07-09 00:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b307f02e5fdb52f3a8f42720c720f4c7 SHA-1: 9e9286faec89f6853ff9ab5577534df0b7011f98 SHA-256: 6fbf4b7a681f4269eb198e83af144a70ad2803d7ba8a73cb3b91ee551b3c26f5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to leverage SEO or disposable hosting to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sanitaerprofi.ch/fckeditor/editor/images/file/nawejigefoseduvenukulutux.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d34506f7ef116c03f350af1cc0e99fcf/ponusazu.pdf
    • http://jrpst.pl/userfiles/file/64863999832.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1u4nkoa4er656qrcu3gi7020r3/80316817179.pdf
    • http://www.deopendeur.org/imgUser/file/keparupogavu.pdf
    • http://interwork.sk/userfiles/file/zufekat.pdf
    • http://aaaexpressac.com/userfiles/file/27134457494.pdf
    • https://alianzatours.com/imagenes/file/30920296593.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c845ad90ec---68684474458.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/717799916a2fb416b0b38a0ab6fa224d/12074642164.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/ce99655c5e1276db6b7573581683e734/77979787116.pdf
    • https://pingthye.com/userfiles/files/83011167448.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76de1664e---91701317744.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31484ec47---likuweveku.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bvvpugccebst8vrh7hnouii5j6/jusogakamodilagenedoz.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b306c5b37f5---15351882179.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ibvf13jtf64qk9ov1m6ntqad70/12672460317.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/21134420160.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/60456097965.pdf
    • https://bloomland.com/sites/bloomland.com/files/3846125997.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f0b05355---81745580005.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3dbc6ee9---tatoputuvuzabixobedazad.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/8debd4bc2628c7577193b9035319f678/84644562026.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=spiders+and+arachnids
    • 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_off0000f539.bin
090c65cc872e2d91669a3a07ad0e99a8f5e2d04abc81859fdbeafe341ff391b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 17564 bytes
font_01_sfnt_off000121af.bin
148180e7fe29e048cd9e49ff03d12f13fb7452180a76994502edf9938efeb6ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 10420 bytes
font_02_sfnt_off00013927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 16792 bytes