Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee4b43ac8b36649…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 21:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a33870b56656b8cfef7e53c8d45d90f SHA-1: d44521bd5556895108e0a51043f99415cd856190 SHA-256: 0ee4b43ac8b366490aaf50aacc0dab5af1ea7157a1d6f6f7f2289005dad48dd1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm for SEO manipulation or to host phishing content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/761853e0bc50b88f65309f7abebe54a8/52019645202.pdf In PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h08t30tfem3clsi18pdopktc0q/52612344978.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/75262974238.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2837727107.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/rifiguvureb.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/zikufipibuzaliz.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/11367190258.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/tamijivolosurav.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/26582576300.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94754001295.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/57531343666.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/3117779417.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/ruxalafolupebovebobadaje.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6a2367aa---zenibitirerefibimudela.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/vudisibumabuzilepekowe.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/lapasur.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/vegoruvuzilutoxemepuz.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/ninagegagetobos.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d5ee5f9---jepetabakefukijim.pdfIn PDF document text
    • http://funperm.ru/content/file/zurusarajedefimotibagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=causas+y+consecuencias+del+alcoholismo+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 10932 bytes
SHA-256: 58af9085f607100d54835f618083c96a8fd13aa826f0f88fbde67e00d8366f2a
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 20224 bytes
SHA-256: 3bc65a6d908072128fb69b936dac2a4f47f2008c6a1f9fb1cace5aa362487228