Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c636ebc8b958e81…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 13:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69b47b43d187d9fb9071b1d4c683bcb7 SHA-1: d00893a787570e413b69d17ea51b1794184f39c6 SHA-256: 3c636ebc8b958e81afd5ecad55f03453a5c4141812281b0615d178acb709b664
154 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. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, suggesting it's used to lure users to phishing sites or download further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9192

Heuristics 5

  • 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
  • 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://musicfriend.vn/public/default/ckeditor/files/sopudifezezowifo.pdf
    • https://cortemadera.com/wysiwygfiles/file/bomujugarowerakaxilabitu.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/81784778170.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16115ddef350b3---xumenovag.pdf
    • http://udokutscher.de/gfx/userfiles/files/xeramekimadowutidurivoveg.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/26517951822.pdf
    • http://cdhsalumni.com/clients/28864/File/xijuwaxukinun.pdf
    • http://breakevenpoint.pl/uploads/editor/file/22484112660.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/bonagukipebasawajudiloxep.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8fe03c5eb---judilad.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/366022a1ee38d9766d5cf990e8336b37/fodoxoboba.pdf
    • http://davidhammerstein.org/userfiles/file/pawawojiwikeneraxavinud.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094335744c69---kozokafajaniw.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0047f33f59---9465305858.pdf
    • https://apskarota.org/userfiles/file/wepobaguliniguwi.pdf
    • http://littlepearlspublishing.in/data/eimages/file/27545940497.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a8a8d4d83cd07b1e6d0b7ec828b2e54d/tejipabig.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/84c586ca1bd6a58866f963de5f8fdd4b/vigonatebor.pdf
    • http://119hero.kr/userData/board/file/deresi.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/gjbgb45c1kvmqvc0u9j38htgk8/17200637878.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e7908d1a---vodigegepopevekos.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=types+of+irrigation+scheduling+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
font_01_sfnt_off0000ed2f.bin
693da6ab3f335694e6dadb47315cc128fbc9a5c60575cd344ebed51b76389643		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 11076 bytes

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