Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5392007f668c1b…

MALICIOUS

PDF

69.3 KB Created: 2021-08-22 02:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69ccdc5244be32161ef8e167f231770d SHA-1: a60f85f9b77876d8a923b113bab59870bf74d41a SHA-256: da5392007f668c1ba28e8eccaafaec8ac3233fb18e682f02d32d9539ba33229c
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7990

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.
  • 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
  • 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://medvor.ru/uplcv?utm_term=az-103+microsoft+azure+administrator+exam+fee PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070375fd797c---56342610390.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/58784538807.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/4465336157.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c7ebd9f8---90227130932.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/2436276476.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/58621701293.pdfIn PDF document text
    • http://dgjst.com/upfile/file/gufemovuwivavevup.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/9377198804.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/nafaluvugofa.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/vdu4giedm8kbh155ohpk3s8phr/47983775715.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb43906d7---pinisivurosiparofami.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/90868928957.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7662ac5f58---fuwejexaxasobefosadinex.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa059474dde---71621396680.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/1763113473.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/lobuvivo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/nipapevamuvozis.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/80d13d4a6d730e1760443b649c79c7aa/11370685300.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pexasowuwajikadokopetudo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3340f45f2257be3de0834d7f4bd85431/33405210117.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/26dba367283a20af6dd4eed124780b1d/90213525932.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/maritowek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/70e3dc649090e34cf6ff5c30543cf671/fenepi.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/17088373472.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20676622316.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d710b524---29080417045.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 15168 bytes
SHA-256: daded89039beeb2e20feb57ac903dff9d72f3a7609edeea794f02b4a41368482
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 11216 bytes
SHA-256: 08e23fd0577df9ac81b55d7ea8fa3515fdb4a7bc65f1c3eb3d00d03071f6250c