Malicious PDF — malware analysis report

Static analysis result for SHA-256 203c3cf8b3308464…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 15:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ff8c20506f3fff11a7df2a8564d94bf SHA-1: 4ebcba031ea64a4d4d76a5f1be112c2e15f50550 SHA-256: 203c3cf8b3308464c7e88574f49e34078716c74c46b51b99c14f591111ed8483
154 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6111

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.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161217bf306e4d---94595893664.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rqrf7fo54tkbigooesg18g1ul6/58457826200.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/21797930740.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/46265359677.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sesuvimewatavejafupume.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/76675957906.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/rogozudiwirawexixegej.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/99063216672.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/33574711611.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/nui8hfqu1asjjg6l8rpds5nes2/34996217018.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/95f93ec704961f32aa8055022bae1c18/pofaj.pdfIn PDF document text
    • https://vleek.com/uploads/files/soxorur.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2b2dc315---7879135249.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ced5976f44d---74292082870.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9fcd66360967baa73c2d8f811a30a946/74876462268.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e4e0e888---38730706411.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/buturipunivedenebuwofaf.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608656fc17402---kafabuzarujuzaze.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c40e132f9---63960346289.pdfIn PDF document text
    • https://nevisnews.com/userfiles/45372020910.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/movenokunalumonowup.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7deeb3342794fa903941032788abeb87/96001721423.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/70254519614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=marketing+en+redes+sociales+pdfPDF 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_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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