Malicious PDF — malware analysis report

Static analysis result for SHA-256 d553708ec4dd05e9…

MALICIOUS

PDF

85.6 KB Created: 2021-08-26 12:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e96b39205652cb3f61b4662f6e789df1 SHA-1: fe6497f7156578370ba74e5d4b394c800d1736da SHA-256: d553708ec4dd05e9aeb4e3fa49d826d2397f138a5346fd73f823016d58d15242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

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 many URLs pointing to compromised CMS upload directories or disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://ct-tci.com/cttax/userfiles/files/6577405553.pdf In PDF document text
    • http://derkwoo.com/upload/editor/files/90656530934.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/70350466727.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/50689460983.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1ap8eju1novpn9fk1ghn9anb2/44302379408.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106280811.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/6630536543.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ga2cvtlhvf08qsnc1be3c4rvrg/92061619062.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832abb1ec92---2139498782.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f1c30b31a9d91cdf0820eb7d9af07aec/kenox.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108111918107735.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/53011951316.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/998ba15b2209af55e86920ba025661b3/julato.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/56361062911.pdfIn PDF document text
    • http://classtool.info/upload/files/31547369347.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3835207181---kawebumasivad.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/suletidi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/96072174337.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607331174718e---nogatux.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bfa9fe23---3924441172.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/lugesoso.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/39619879450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=since+now+onPDF 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 9808 bytes
SHA-256: 8e7ec8293b4cb048f2483067c69d8d0f031509a9de8c7d41622bac5c7a1b37cb
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 16720 bytes
SHA-256: 14f1d3b8f41e415273d21e89293e952dd462738cd93c1b818202b15ac68a573f
font_02_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1