Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23bdfbb2ea9fae2…

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 13:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dafa61d99906cf4f1b00d94b666ac4f8 SHA-1: bcab6ed65fa65b73d9ec912dd649831ce13cc467 SHA-256: f23bdfbb2ea9fae2341b26f20aaee1c97598b8121bcb9c63bbdcbb9fe113000d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded JavaScript likely executes malicious code, and the link farm serves to obscure the ultimate destination, which is probably a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/65c8027309974881be5e500ed8e20f8f/42587673765.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc6dae411---17679869260.pdf
    • http://albino-pitti.com/pub_img/file/pademokoxofolixexeg.pdf
    • http://hopkins1983.com/clients/861771/File/zesiwe.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/73115a55079efea97c2dd743b64a7126/65713552549.pdf
    • http://daieimotors.com/js/upload/files/mavixaluvulonomofeximudox.pdf
    • http://phdpecs.hu/userfiles/files/jukaxapera.pdf
    • https://ikima.fr/uploads/file/20037055371.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/36043165490.pdf
    • http://agrobud.net/uploaded/file/lobiwufizosekigimigazibo.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/10bjhu0k1ktnmgbkf22k9ko61l/90328741385.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3f22276a---wetojaxopevapejuk.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3bc26edc78bb45255c9bbcc2c8ac49e9/juwelubevotugalu.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1b06e8c4---dusizowuvedul.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/608909c69df29384330306bf5e4d13d9/gudetuxusajibipo.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1ebtpambpgl347u3fevn4b7um5/rakusen.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7437f51322---73971611068.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd42f86ca7---roxabigobimagugizim.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071976a4d23d---76600887351.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/jisagusepiren.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1087d3630af7c574500d3a449ead7803/31642772681.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed44e7f78---94217258100.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=women%27s+rights+movement+definition
    • 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_off0000f97b.bin
7e698fb9c6557df6f19d17d6b3cf95d3734ad92c295cdb1699f7adf90ad32e52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 17208 bytes
font_01_sfnt_off000126a8.bin
1ac73fc9df74fcf50c2a2d5de1fe60a2c67917d34a6ce1802e56b5b01449fc2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 10684 bytes
font_02_sfnt_off00013ed3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 16792 bytes