Malicious PDF — malware analysis report

Static analysis result for SHA-256 968f6fcdf0269170…

MALICIOUS

PDF

101.2 KB Created: 2021-09-01 21:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e19454e62887673ab9e0d3a838ee639b SHA-1: a7ea9cd179ab52d50085dd6adc8175c979f9ce99 SHA-256: 968f6fcdf0269170efa86baad4b80c047da9ae1eee077d60a5acb6cfa7d02408
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm on disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, content through a network of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bigandtallking.com/userfiles/file/vipomujelujete.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ds0e68ggtfgkjceejlrs9gmksn/migidij.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/31369374190.pdfIn PDF document text
    • http://venturahigh1967.com/clients/40640/File/dufokilesoxi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7f93cfedc---mawitukuparikanezose.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eb219cdc51624d6fe7dcf187a3616484/pegudalumopeluderapelon.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/tijakiwilutufigavopiru.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071722fc8022---69932617546.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/41910502450.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gasokutobadizib.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/wonoxijisumugemuso.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5b557061efd153a75318600c364cfeef/bususeko.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e520f632f9---xaneb.pdfIn PDF document text
    • https://zold-kommando.hu/files/zudewilamejadi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/49491385853.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/30224744686.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943322b47d7---6112970318.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/82733883412.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/83143514556.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/77215362614.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/chcg0hm5q4p8oaeqd0bbq0fj73/ruvikeranimanowijuni.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a910243a7---mujob.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/rekelasotozotodawite.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202181128246082.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/tedexajawodopadotamu.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vajojupazogofugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=roseanne+barr+and+tom+arnoldPDF 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_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 10504 bytes
SHA-256: 735380599dd90e323c983e312cd1cc7bdd90b2812664bec95074ef96a8717298
font_01_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 21204 bytes
SHA-256: b68077f42b6434c57f8be343fb1deb84ebdb9393b1f29ad540b434dfda2a1935
font_02_sfnt_off00016ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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