Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdbd142d072aea2…

MALICIOUS

PDF

97.7 KB Created: 2021-09-05 13:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8512756705986143827a4b499b6083c2 SHA-1: a24448a042353547f400bd3ff5e2c30b67ac1520 SHA-256: 0bdbd142d072aea2f88b06b9485faeef48f5f4e4d049d975f4c4e80f7aced780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to domains identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and numerous external links align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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
  • 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://kit-veron.my/ckfinder/userfiles/files/devegubaxawugomifuwajomas.pdf In PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/rijafekajafe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cce985aac---58061439593.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/puvirufatupedi.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/jufeb.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/62786476400.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/70437071376.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/tibonuwu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a914979bb11---26319447240.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fawixufezoriziwim.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9a0dfc647042e2ca92c48252888aa4e1/bemagozebodeburuniwojod.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096f967e6ef6---nojogin.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/491298433.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/81802785781.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/5274ec9818a88e1dc2c83b53c59225e0/293714716.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/ganetirajelegavotege.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f730ff07---73140118803.pdfIn PDF document text
    • https://clinicscrm.com/img/files/4060418638.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2195402072.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073db4771bca---98926691844.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608700ba6946e---dunopinakebaxetaza.pdfIn PDF document text
    • https://arendic.cl/files/24859455280.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d634eb133---83393362956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fifty+years+of+nigeria+foreign+policy+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b3a2519e5---76756171439.pdfIn PDF document text
    • 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_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 19136 bytes
SHA-256: 87878d4359b3cc6675470bc1ae803f707a558abb4b85e1ac4c8b46e1b9e648cc
font_01_sfnt_off0001473e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F55 10888 bytes
SHA-256: e19be992bf3eac5b52d889485e204571f140e5fb74e3f21891074332a6c6f0d6