Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d8bb904fbdb825…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 20:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0ad860e3354d032113ae1301d879d7e SHA-1: 2590eb9a2b449582b797788d218ae3d592dd1b94 SHA-256: d6d8bb904fbdb825a89f6826b5c740f0d6298c6cd3e3abb1bfbf7c4826ac19fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://huntic.ru/uplcv?utm_term=potter+county+gasthaus
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e4ca5c354---dosozuto.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2c1c4439920028274f1ff65b5d5aaeb7/lelanedu.pdf
    • https://amitadevnani.com/userfiles/file/85721661586.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/affcefe24f1fe10672a96a95017076c4/83450077457.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9908c01889---35002668988.pdf
    • http://camionespanamericana.com/userfiles/file/48564976104.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/rizekapur.pdf
    • https://clubslotalmatriche.com/calcas/file/19650273246.pdf
    • https://allmassage.net/upload/file/20210522141640.pdf
    • https://loyallcanada.ca/editor_files/file/83672371527.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ff37d36dba09ece23b04475bca6b7638/17482505828.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pif2h2hsn5bk3p9oeh30gv69v2/18653843382.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abc18ace19e---bemitipo.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/097549cadaf33036605f83c01c16ce67/21095495613.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160822436be4e4---fuwegufegetavorevezuxar.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/66e56501b28c2998d824ed07f4118cfc/wetunuv.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/toftblos6q804c79bgllg03in4/15730704503.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4463e637---99565945113.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/ruzinifekijabum.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/672ba33f35f9adf3e85cdfe1e47601c9/16160695045.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b95309e59---fijisapulikazowuf.pdf
    • http://zdrowejaja.com/Upload/file/jajuwavudekajavuxojikesa.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd67ae2a---84440851817.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e9166fb6---68151197450.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin
71604f4bea4871724aa0baf7856e0b02750e0f3d512b0e07c4f4ffc96ac86a63
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 22664 bytes
font_01_sfnt_off00012677.bin
f3cae8f089336a9a3ebdf87254b3ca931e48251d3a673767b5de68b819ed58d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 7620 bytes
font_02_sfnt_off00013f4c.bin
3572124d5a729ba5430dedf783852bbab59db1abf6aa96d03a859027ab1f4cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4C 10584 bytes
font_03_sfnt_off0001577f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1577F 16792 bytes