Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3adb18c61fd913a…

MALICIOUS

PDF

83.4 KB Created: 2021-07-09 03:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 9a5a76a07382de7aee1b9191eccc430c SHA-1: cbcad8bf7cac5fdd84412c420f2b35903eef23fa SHA-256: a3adb18c61fd913a1c6163aefaa99f42ac148c1d118b60ee7393a93d1b0eff58
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as a lure to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=lds+yw+camp+manual PDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a7b31e823---26636727263.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f08b438---gijagazufejazivajikoke.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/paxupedijuxe.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/16385534830.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/33652224561.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb33e3765---semuraxo.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/98896900648.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609784e1153de---12796606315.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/93145597729.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd5172cc9b---pegubex.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/7775617834.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c323a292e---51258554142.pdfIn PDF document text
    • http://aplus.to/userfiles/file/65528413228.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/d3cc36d19cbe9d264c9ae6d9475f241d/bebozufokunonegukodufi.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/sugesuvekatawoxedit.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/17830908182.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e10fdfb10---84602968503.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f8efb868455ef6830184427c4ae8d19d/91784260716.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/6sesaagefjeek4d66ur133sken/94780747858.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ragujakosodogijeruzisatif.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5352dbdce9---14641565197.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/982bd966203aaa3b5f2e4c103c5ec190/3048908238.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/ponusib.pdfIn PDF document text
    • https://tonitomov.com/picture/file/27229389990.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0644f6f33f5fc4952955e62d6d39102/92556279568.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_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10392 bytes
SHA-256: 486ac15cba4ff8b977043998b6fad446e28ef9fd44a20f5f2cc32a93e33ea70f
font_01_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1