Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd2dbacbd384c5…

MALICIOUS

PDF

83.4 KB Created: 2021-08-29 08:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08be60a975d46083fa4fb15d53f024b4 SHA-1: cdd3b8e6c4c839f1b09a36d9ca1d33203d71d353 SHA-256: 16bd2dbacbd384c5d83b5055dfb82ffb57a5792e0ca2759fc0a2e1942cbc6d93
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://www.gieskestukadoors.nl/ckfinder/files/files/16806094835.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f23d2b9b---13124552488.pdf
    • http://resetimpianti.it/reset/public/file/70601030944.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/31847cc5cc13969887cd8e68a0b5ac28/fekitilobolil.pdf
    • http://insuralead.com/userfiles/file/30914670536.pdf
    • http://agataklimowska.pl/userfiles/file/rinaguguzonemuw.pdf
    • http://autolubitel-irk.ru/userfiles/file/razoborom.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/bapuzufipu.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864ae9af93d---19335725733.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8937cc089---korekimamekodat.pdf
    • https://cornwallstaffagency.com/userfiles/file/subeganomewuzeli.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077153138656---nuzulozugejudimoxutedo.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2adfb451473f2beb8d95a2c15617b562/bopetuk.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a747110bbb0---mutiwivijogovoferudojeze.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/conn4adio07kra76beto49s7r4/87172407848.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7fdb7ac5eb2bbf039e662e9017cf62ed/vebitujogowudukezefepaw.pdf
    • https://absoluteanytime.com/media_file/files/files/sumusonesepejamokuvilare.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c0350e98---sumukokawisuvaveta.pdf
    • https://harvestrain.com/wp-content/plugins/super-forms/uploads/php/files/5dfcc808d4f93ddeba562e0320c5a547/21122909290.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88562841f---17524960783.pdf
    • http://zae.me/datafiles/file/fujovobuzez.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0bf56a86e3cd5c6d5a8fff800327e54c/gufilafuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+book+of+dragons+for+5th+edition+pdf
    • 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_off0000ddfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 16792 bytes
font_01_sfnt_off0000f610.bin
f330209c63d31acd839b1854c30414e24d6d0165582633500a1678cba8823d79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 18176 bytes
font_02_sfnt_off00012535.bin
985d65347bfd8014216404d9b79307476d19f456da35bbb8b337cbe1063ecdbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 11060 bytes