Malicious PDF — malware analysis report

Static analysis result for SHA-256 c033f7dcc4ca6ff1…

MALICIOUS

PDF

59.6 KB Created: 2021-09-06 04:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 994c225af6c8d92859a4eec501c6c24e SHA-1: ed7716b6199f4fdaa942d4ced24c8e7918894b42 SHA-256: c033f7dcc4ca6ff1fcc36ba18b33e1ca1c446443c2569a6330d57aed2540ee1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9472

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 https://catamma.ru/uplcv?utm_term=kegiatan+posyandu+lansia+pdf PDF link annotation
    • http://apsencollege.org/test/fckeditor/file/91211051555.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f585102bbc---50260015478.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b429b309660---54456220471.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/17586654600.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108025615a---komonanipavoloxe.pdfIn PDF document text
    • http://eva.am/files/b5a4580855536cd7.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0576a1204---49002398655.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/vukixupuzafu.pdfIn PDF document text
    • https://examonline.org/examonline/userfiles/file/78768522410.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/9044103492.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/14465190820.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9fa7e1bb---sipiwuvalarajule.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eb8dc632b85a117e0d2d731bc4bc9bdb/gixegagol.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/109d7b5f5bf20862ddd250caf88079fe/nanagana.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/rozopukel.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210818102624.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/lulexu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kovilesedatesug.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/81222254929.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zonusewejuloregaveluxebo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dbe8a7320---nowawake.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 10776 bytes
SHA-256: d0b40bad4d5271a5af38373df92221a33de97cb6a105da835af6083ea12a8150

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