Malicious PDF — malware analysis report

Static analysis result for SHA-256 844de7c3816f1557…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 22:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf3c57b00e28c4928d09764a8823f5e1 SHA-1: 87ce77e92874d47c63e0e374ced5a1827bf500e8 SHA-256: 844de7c3816f155728770ad887cd335b8906f6e6ae5ddbccea5db544e74dae9a
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. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. The presence of embedded URLs suggests an attempt to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://virtrade.gr/userfiles_lybo/file/73812810948.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r0d6eicgs8t3eile3o6mep5j5n/tixidejijines.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdaf59252d---55561239810.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160737189588fa---295000581.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a954cf56e---5924769377.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e03bbe04681aa3dbb32e9de4fb474e16/61294630670.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/28094887607.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kunasotijifiwona.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/zafutixibovalekifixe.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3a591d596062ff722d187ada07f44f28/32328810675.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abae26444d4---26062549309.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160819cfbbd2d3---vezazupoxexurulizisug.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087483579254---gebanuvanatifemonisubewud.pdfIn PDF document text
    • https://redac.ch/upload/zajawegoval.pdfIn PDF document text
    • http://hrudolf.com/userfiles/ginazikezudidaxa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d55e7e6f2---masudolebuvovapaxo.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/panumupujagijuketekakot.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077141586300---jelobakezijuma.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/555bc7c1c9118b8d0b4411a19eb959e6/nopivubojinefuw.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b7ed129b89ebbf2b454bb28a40a75d55/maromexewaxubujaxazil.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608138502decc---81535003212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=certification+review+for+perianesthesia+nursing+4th+edition+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_off0000d6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D3 11212 bytes
SHA-256: b540e5317f80a710d21bf7db3b9a6df74d234fb6495f7b72be677bd2aaf51f54
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 18368 bytes
SHA-256: fb0ee289fa465f0dff2dd45422c6fe7879ebedc2201824a68196e2763a0c4a93
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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