Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e99451df3791672…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 14:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a11d321126298820ef1bb8bd0ca621dd SHA-1: cb5f13dafd640444ce4f000f61efe1f08b8f284e SHA-256: 3e99451df3791672df799fec78a132f587891e85971c4900387dd5299b911756
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to potentially malicious content. The document body was unreadable, but the presence of multiple compromised upload links suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2e690f61b46a9b7d36b008c66e50488f/siborakafumawanotobada.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/patelukodafuzarefemu.pdf
    • https://noihoithanhtuan.com/media/ftp/file/60663433725.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930cd0dcf79---jupemiriza.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6b58027c---tavowedobiw.pdf
    • http://auksozvynas.lt/userfiles/file/65084850216.pdf
    • http://degrossier.nl/uploads/file/66777146444.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081a599cc71a---17806464990.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mtkdqdsddmih2uqfmv9oopenid/jaruvuwubixe.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b559ddfd8a---55319611674.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3421bc79fb8067f44c79de7d5c3e19ab/ranurunasusiwuvojuj.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/zokufekikumalegivanoba.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/82666176945.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d03a42ec6a89cc82b90a9ffcf89f8422/66370158237.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/dofuvudakinirafi.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/871690f047713380c6b0491715569c7c/68065054327.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3e675cc9ba18d848f5a47cddc2486fdb/46621570520.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c06442d61f3---fijipolozonisokukoxitil.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfbfc5e672---39892499774.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nedematumikatig.pdf
    • http://diclenakliyat.com/userfiles/file/72492646320.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62b7981d8---31385731966.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6f93ff987b6f07f774a4b1379b3706ef/wigosukakaj.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tfvf6pb5k6vfk5i16fc7gjuem8/89811615690.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+vice+city+phone+call+missions
    • 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_off0000ec0c.bin
d28f23e96d666fbe7d7ce7b54f23e2a6a04c8acd0774f4a9229da39c1613534f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 17004 bytes
font_01_sfnt_off000118b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 16792 bytes
font_02_sfnt_off000130cf.bin
1518b162eecc90f2e2902950c7e49bf4411fff3dc3dd5766b6710c54f46e2d32
pdf-font-stream PDF embedded font (sfnt) at offset 0x130CF 10756 bytes