Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac91f367d8a37a…

MALICIOUS

PDF

66.4 KB Created: 2021-09-06 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c8640a7fae0033a346f4b6c9c1e049d SHA-1: bcde0761744446bd71d835618d1e877ae53b3f01 SHA-256: 78ac91f367d8a37a379d6172a0d9140ede7632aa88c800d752656d0577909486
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, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=fourth+grade+reading+and+writing+worksheets PDF link annotation
    • http://grandinhr.eu/images/user/file/33870671691.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48e457ac7---60080587481.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cdb392c96---wilanubabelamasuguro.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/lafofojotebime.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/181f77fd3d152eff3115063105d1061c/17144336832.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lojakelufi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a301f32c---30757221757.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-2/20210702062626494131.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/51763509997.pdfIn PDF document text
    • https://coluer.ir/documents/file/97722360499.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/pexurusitemexafesex.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb1642e41---47889953882.pdfIn PDF document text
    • http://ridendo.cz/files/file/jifuf.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/2259537762.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146610093e---xijuligavap.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/noposejefokuzaxekof.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/mogavazezekewuxuvusoret.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021081520202119.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e5255f9d5601fe8833b1d428bd0a70ec/61200379721.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/rozaximijer.pdfIn PDF document text
    • http://terrietanaka.com/library/files/73493167127.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_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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