Malicious PDF — malware analysis report

Static analysis result for SHA-256 67216a615a1168c0…

MALICIOUS

PDF

91.0 KB Created: 2021-08-10 01:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11dffac05e37b5fd22c3b76a09b0df17 SHA-1: cc304a10a9a26d08ecd88d1cc7557bf20e9c659f SHA-256: 67216a615a1168c0794a84c0c012051bd71a67c5a4e183356a408793dae9b782
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba12f8dda93---laturebexevofulevufalopij.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/73304f79ff56b32af54c1b349fc7ab5e/66242151980.pdf
    • https://ntct.dz/ckfinder/userfiles/files/dodavifitokodov.pdf
    • http://busanpc1.com/upload/fckeditor/file/kogexonedadegososo.pdf
    • http://www.anclupnapoli.it/userfiles/file/29815085428.pdf
    • http://2990592.ru/ckfinder/userfiles/files/83026056625.pdf
    • http://autosoftware.company/autoresponders_images/files/21078303707.pdf
    • https://seikico.net/img-tym/files/wedusumadalidunogu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/99c46a8d32a09a8bb3be275508d6b25d/4119995340.pdf
    • http://gift-founder.com/archive/upload/files/kulikifikarizasanax.pdf
    • http://shengnabei.com/uploadfile/file///2021080200430840.pdf
    • https://waroproject.com/file/63050160471.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160981532803e0---xajigizijixeluxopet.pdf
    • https://walkandsmile.com/userfiles/file/61561872002.pdf
    • http://fullx.net/files/47597656188.pdf
    • http://bettynblue.com/upload/fck_img/20210511/file/vulotafusewele.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/01ad6160ad29b0493e999d30ffafe49e/kubuduranitatotu.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e308ae13f4---nividumubozese.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/rumipebelazelexo.pdf
    • http://allaboutdowney.com/userimages/49181986539.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/1uiv2csr215h5mhl340rfu620o/rapometezuwamifax.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adee28eea28---pevitevububixakemel.pdf
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/65316250286.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+barbara+minto+pyramid+principle
    • 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_off0000f9c8.bin
94fe3b21b0cd02a5b90a54aeedf5345f667f00bf999c83246191993269a7cee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 18952 bytes
font_01_sfnt_off00012a81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 16792 bytes
font_02_sfnt_off00014298.bin
4cc04fe4ea74013c236bb7b43a2794ee15e0fedecfc3aec56ead449b00647a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14298 11024 bytes