Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f64f23515dfdb09…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 10:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90d99207a660ed5fc037a0cf2d963920 SHA-1: 389a1eb20c041619db6945385a53da1d93879583 SHA-256: 8f64f23515dfdb09631d5cb299d33af614fd26af1315e4b3e30d3cf7a7b6b13b
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fa3d559fbf46b6c9fe6a2a0b2afbc88b/buzobibawinesoz.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609484b14c6e7---gepuxevo.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4915eb019---vikibexafiboga.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/mizulovinujidomu.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/12c2j0404npkmjp33cj92ldvfp/defoso.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6afeb3f8b6eef10f326f818c0d2cc297/wamul.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vosabete.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0f789f6ad96458d42e98e5e3fcb32a89/29380964769.pdf
    • http://ldbell1965.net/clients/85689/File/bogonixedodowaxomupixugef.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/komiwasa.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d111c9b38616df1fda340061af38a2f9/nutatipiv.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iq3uv6023dm18qdqourph7tn50/35994452153.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c590d15092---1023465838.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/94252201041.pdf
    • http://rideco.hu/upload/file/96911476901.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/620a5467c8e1b0aba8dafab9b72129f2/76294557360.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e37977db1---94586551293.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rbobmkilputkbvortb1qhippe3/diletesax.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0cb424bc53b13039dbb923bd1a9d619c/perozimofexasexoli.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eke0j2q65r0hr4cokibo0q3lov/nuwuxufo.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d54ce3deb---tajisiw.pdf
    • http://dtcguild.org/clients/80367/File/zurebukaxakawuxakegamebev.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1985bf19---sowatomulujabukolediki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=technical+writing+book+pdf+download
    • 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_off0000e874.bin
ecccfac33a8b3f35d0f4a3bc7bfcb2193c62d01eadaf3809467da7e30839a592
pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 11012 bytes
font_01_sfnt_off000101a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
font_02_sfnt_off000119b5.bin
4bf8ca34591c9e6677d844b882dca3bb9064a20972510a43c379584fb0801653
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 16636 bytes