Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cb9c585cda1690…

MALICIOUS

PDF

83.9 KB Created: 2021-08-29 22:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f79e171063e200967cfc90aa7801d294 SHA-1: e8668a7f29541794197d1d1b23eb06b42af73998 SHA-256: 67cb9c585cda1690212bb3a639d74df1969567ca27064c68e2d0fbd7eb667271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress and other hosting sites, which in turn host more PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment, aiming to lead users to malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://rimsball.com/ckfinder/userfiles/files/80159894126.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098d44d7a33a---25637062409.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/lajenu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7881127b8618908305f11dd8f502e048/mixakugotaxumafegiwi.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/todaratusovedokak.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d5c6ebdc---xilafi.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kosuzadiwizede.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/sinomas.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/fepexubakovinobaxigixi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/64486556831.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/19118754299.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e579f6962d---ruxudotesaxo.pdfIn PDF document text
    • http://potlista.com/file/files/24066631519.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0928676a5---52088688899.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/87988013695.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/86745707678.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/90045629491.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c26bc1934ff---25507737390.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/56222199659.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/94422355389.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/81505080479.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6093e873ef8205515fb0452a34ba103e/31940114632.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/38o4ds166ccqi36r1fa8om0gqo/98732247217.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793efa44fcc---gowezarikunevelujepas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+merge+documents+in+goodnotesPDF 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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 17988 bytes
SHA-256: 51fe7f804442b3e13e15383d5649c50db5118318d082dc376b5e4bb82366867d
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 10684 bytes
SHA-256: ecfb12c8d89b85ef6c7af83607dd7871b7bf0f3bf2f96eb823e519f7017c08f8
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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