Malicious PDF — malware analysis report

Static analysis result for SHA-256 56740616664773cf…

MALICIOUS

PDF

84.0 KB Created: 2021-06-27 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf79917338951c1399fe343eeb086f75 SHA-1: cb07b5626d2b51501032a4bd4c97d2a0b0918168 SHA-256: 56740616664773cf7c4846f4cb615f9621ac463583865d0bf80b3b4b75a9c047
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous embedded URLs that point to various websites. The ML classifier strongly indicates maliciousness, and heuristics identify it as a link farm on potentially disposable hosting. The primary purpose appears to be redirecting users to external sites, which could be for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/pogoz.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae51be291---milobipufos.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/0789f20bacb11b2b2dd418fbc91e75b1/vezamudiwibesekobuzibime.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/08p8svopbb3uhrf1a5uka49h8p/wokupifagaviz.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/64a19af495cb3f82ec12d03c96c6504a/43618637068.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/24a0609eg8n78b87hasqplpssk/29667311801.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuroz.pdf
    • http://greenplanetnepal.com/userfiles/file/mepumatemofole.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817de2c1b8f---mopeputuvonoza.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dsefk66nqppmsff2kkpp1oak7/fagamebapavipipuwex.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5b429acf---wipasasi.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608294a509a7a---watobu.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b5851258---7485025073.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/p8jim5m290tpdlhfck8tadvrf8/moxaxejegigoba.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/lezasejipovosevuxukijoz.pdf
    • http://goref.ru/files/file/29399607159.pdf
    • http://strandedtattoo.net/file/wasizepizinijorulevuko.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f0c34aa---35415358891.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/9b2db52211f28952cc29cddffa1db4ef/17961874401.pdf
    • http://brenno-tojestto.pl/userfiles/file/10279228479.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54694754b---numowokopipavuxomonemave.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86698d2ebf8ed9d6b49640abcbb7cec4/xatojewipokit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=path+of+exile+best+character
    • 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_off0000e6f4.bin
b52ad281d94e6e1aa7a55d3d7ce6ab00281cf3d1e56dc63f757e31790b818dca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 16684 bytes
font_01_sfnt_off00011287.bin
f333a19b967b785efbaa11f8cc124a306e3204ea6828c6d358206be9fb89ee0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 10572 bytes
font_02_sfnt_off00012ad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes