Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e28352209c35d6b…

MALICIOUS

PDF

79.8 KB Created: 2021-08-20 11:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b765aa33edcd69ae46bca461ecb0d57 SHA-1: f79623de811a3c88d31967e001795a3c450d5205 SHA-256: 2e28352209c35d6b925db79c9c4d84d0f04845704515b70a68c1c3e4387e50ff
154 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. It contains numerous links pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The presence of these links and the overall detection pattern strongly suggest an attempt to lead the user to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8445

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 http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797b0e0e129---kotofemoxidisukapuw.pdf In PDF document text
    • http://akwarella.pl/user_uploads/file/nadunetumo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b3f6dbc3---musukonofevifukikije.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/xonavigivatokilixuwul.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bce1d6cc---65002299824.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bf07994c---manulotofesunadirol.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/xedavanesinamu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/ralokapif.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/66692921740.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f40f1cb80---64384844192.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/remoxipob.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608572dcd7e29---rolukalarol.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060223143810.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c038c028ff---30715334297.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/sebineg.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/navapezelasopavolazefalex.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086339bc2173---xuwuwis.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160899c076c010---33105629110.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/511bf77f4a9da8b6f90682a3696d8845/depufowuxixitugova.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062e6b2bcbb---razademavi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4afb9c34df---91424929239.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/tovaxapezok.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e44e4a137d6a3baa89ccc3c6c94c82b1/72191717643.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e576e679---melogeja.pdfIn PDF document text
    • https://efnnma.org/files/file/sasagagik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=culturally+responsive+teaching+and+the+brain+chapter+1PDF link annotation
    • 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_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 17176 bytes
SHA-256: 3928ad1a09a89a675411b344b168fa8c153a2fe5b2eddedf21a1621015a97e02