Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c23a9725d81b49…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afd2ffbe809d626cc34c140f6bc83ff8 SHA-1: adc055ed917937843958de0c31f44c31952f2c6a SHA-256: 24c23a9725d81b49acd22a944fdbc9655cca6656465e6563a10644f2bcf67d25
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The ClamAV detection indicates this is a known phishing or trojan distribution method. The presence of multiple external URIs and the link farm structure suggest an attempt to lure users to potentially malicious sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2556eacc---falipegefafijibewogulula.pdf In PDF document text
    • https://menlopark.com/wysiwygfiles/file/26993565806.pdfIn PDF document text
    • http://asja.ua/userfiles/file/5382171216.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/kekukuwivugamo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ebd7e651148e85ec27af832f60cade51/famijemenasiduro.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/94097225166.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/jilumenenaseka.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hck5afl78jih7u0d0t4r5idu67/93500103716.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/95334228421.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9c20c234---89109667592.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f993fa19986---gajutisufonefoxe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a2c39a15c9a1b766dcd2af4849b1c241/69124702252.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/tatakin.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d8ca81843---69350846569.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/kinorusumi.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/boxipisogudeg.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wuvotujakobexo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210827110548.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de9e8a2886e---20803417949.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea3fb601e---5683546138.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/jubosokugiwuvu.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/15720438754.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/41636314897.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839d0a27f36---pijusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=under+reamed+pile+foundation+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 10600 bytes
SHA-256: 67f32ebe62b709d6a77b5aa1d289d940202c5961223f090904fcb410768c9ee2
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 17520 bytes
SHA-256: aa8ff5a615b806d176c40825dd6074a123fd59215f78e5c4cf35858295b6f96f