Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea42735c5afad10b…

MALICIOUS

PDF

69.3 KB Created: 2021-06-28 07:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 993032ca60a24fa59b0191c40d4e3318 SHA-1: 3bb291e45c63795fa0b258205c3d9bfcbf8ed89f SHA-256: ea42735c5afad10b16eca8820c517ef36549a3601fa878d24032c87195c7dcf5
94 Risk Score

Malware Insights

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

The PDF document contains a link farm that redirects to multiple external websites, some of which are hosted on compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious or compromised sites, likely as part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

Heuristics 4

  • 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 http://wksystems.net/HotelEstimator/userfiles/file/92849946226.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd05712769---44047440699.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b26e8ed1---19175021319.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/83260378967.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49865277163.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/94c40dc302b5528a5e827056490803a1/857327332.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae3690765b---63877151033.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946db42d8bd---58724559847.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ca564e9c24d64cdfb0e95e87afd226a3/tafoxuxivizikaridol.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5d751c9f31be888b7ec06e399613b7ab/62135060450.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kalabekibasewuzerisaju.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/24947538881.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/582b746a3c198e7d567012bfee7a1720/73545721320.pdfIn PDF document text
    • http://learningkey.org/userfiles/pojerag.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/73523008332.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7e260f0b0b6c6e432f5d8a2d2c1d6b41/vunapabugiliberawaduragam.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9bc3658a---33376031817.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/44uuhkenb1iq89mlnog0177shp/32569364794.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gorixululi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/junijum.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c41ea67e71---62424525782.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/7usg4lpjmoh7936ip4qgq1fqvt/fisis.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5d3fa57401ba46bb289ee2c342a64a6d/vibaximidimeketilotuwir.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b96cbb534ef---59399894715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=different+ways+to+say+friend+in+spanishPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1