Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f2a7a947963c8…

MALICIOUS

PDF

64.0 KB Created: 2021-07-30 18:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8d2f433bf3fdb90d8b23abb3f4408b65 SHA-1: 642a5b15f43983ee822554dbeff65adeb8286908 SHA-256: a39f2a7a947963c8ce231fdefc648f94054da62d13fb15df6250909b82f59e1f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which detected it as a phishing trojan. The file contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing pages. The authoring application indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8604

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://nomylo.ru/uplcv?utm_term=spartiti+jazz+pianoforte+facili+pdf PDF link annotation
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/952857718b99a1db68b8a43b69c76c4f/tajekutaripalo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/14363f0b9da10de7f7891d110fcfa63a/18592686818.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/6577382648.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/45275724009.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608679c38fb5d---tepeg.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07eee293b---55223905238.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/karezakifepegenobawewofib.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/52836479641.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zixatigisas.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf329ab71---botiturasor.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/luvepitasavikole.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/23725733407.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/99409538941.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4e9c428cf0734277bef07ed933aac172/3430409010.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/vowanunep.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ce94530eaa12923d518c0be009ba16b4/bokagubidokewonow.pdfIn PDF document text
    • http://mp-journal.com/media/file/41397613710.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821bacd3e86---murigebakupi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/furevav.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/77060238885.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4ab567580b4cb13473642f24c81af0a0/11146598713.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/56463498064.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/moneranasi.pdfIn PDF document text
    • http://quaint-house.com/sowide.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/sojomamuzijosetajek.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0f421db1e3b86ade6fe1bd2f036c1338/pexawafigukesedelupapulol.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nebevepizigupomafusato.pdfIn PDF document text

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