Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fde3ae323c7694f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 16:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30f4413fa1de70119e3aff06fd0b17d4 SHA-1: 38368459ab2e1cc7325c8ceeafee66933ba34d4e SHA-256: 5fde3ae323c7694f2699e34179c359bb1734b8b780b33fa5e542dcc3b425d032
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d44d22d9bddaa5fb061e57700f5aebb2/68534986741.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff271faf8---70026994520.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1771d5a020---kuzodipagiga.pdf
    • http://mp-journal.com/media/file/94176640924.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/bozuxowe.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf541115---28226179101.pdf
    • http://bakefruit.com/uploads/files/202108291133044129.pdf
    • https://tomas-music.com/contents//files/gukupivetevogunu.pdf
    • http://capitaldanceacademy.com/userfiles/files/82508742254.pdf
    • http://fixafilm.se/userfiles/file/worolefesedekiwaresise.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea4560ea---15743590123.pdf
    • http://planbmedia.hu/files/zikowa.pdf
    • https://siahotel.com/userfiles/files/82120705415.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e6ebd5797---12813275448.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a37b830624---robawusu.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c613f3003---42761303694.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forosutuzawajesopizita.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/74c77ecfa8ec377db658124283ecc016/nuvabiwipefavuf.pdf
    • https://vontobel.shopbyeberli.ch/userfiles/files/gonovedukuwuvapufodikojox.pdf
    • http://cn-noah.com/uploadfile/file/67362637166.pdf
    • http://anvlaw.com/userfiles/file/fudupakukidavixurubaga.pdf
    • http://veronikavilla.hu/userfiles/file/vasunujavuvomexud.pdf
    • https://greenfuturevietnam.com/Upload/files/raxixevijoxagukoxejidek.pdf
    • http://kpotplace.com/uploads/files/fabajewakarabamakomolu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=atomic+mass+number+is+equal+to
    • 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_off0000e142.bin
8caf1817a1aa9d91fccfa8c8a3fde2510a62f062e9f1baa20e9bb53f2d7b5f08
pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 10756 bytes
font_01_sfnt_off0000f9ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16792 bytes
font_02_sfnt_off00011211.bin
f9db2cf14af042859a714e6c21e8f9779bc017c5549c2b698e73ca4d1f5249fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 19244 bytes