Malicious PDF — malware analysis report

Static analysis result for SHA-256 4519ce0ed830ef32…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 14:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 36f2a43e260c57670c83c10a09109db9 SHA-1: 4f617732b21ee031b1af1c93d40c6ddaf25ea4f0 SHA-256: 4519ce0ed830ef3242a27e27e619231d223792f4003a640551e352a44ad0f4b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/08f122bef4ec2cdf750ea6a7c1838aa0/94681355261.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608216660a227---kudoxurenumazu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b9b34a1cf7a1062a0c60e578cf5b9f0e/letilomaguberorulemazos.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe18c8487f---wufodimenevuguwupuzijawe.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/wurubagazinozejazijiposag.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1d4dabf83---78335201530.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ae29449a41be1ed287bf10c3e8d47c46/82568369564.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/7920640949.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68479188e256922037e52bf1ed9df8ab/42079191850.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/42353535852.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/75871142940.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/rogagimoka.pdfIn PDF document text
    • https://parfumzone.ro/files/file/3785401337.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/26959306105e43e91e2d14cf09990af7/46394947403.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/14779025392.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/20351677790.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jobowokorejukenubebubopi.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/waradogaweripizijeke.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5e34b101f8f1e5c17886e7d3424fef6e/98186414578.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/zawitaboxozame.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2g5doiecpodkqrvlbcheiqedns/sanoda.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160808636b4314---saxilesanawodemab.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8711c4a04---bopuzanakefefoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=medical+surgical+nursing+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 17152 bytes
SHA-256: e0ea2256fe0ca4ca958c3b1532f6aecf9f2c20bb99930ccbecae7a0ee2d72c1f
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 10876 bytes
SHA-256: 9ce426d45309d1d4d5a760d8c6775b489869ccd5f35967b3d3128047c82578bf
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1