Malicious PDF — malware analysis report

Static analysis result for SHA-256 621e183c268d8005…

MALICIOUS

PDF

68.4 KB Created: 2021-09-08 14:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2dee884d9f0f463bfaa4c6466e64aaa SHA-1: 8225e792baf2d46be7f3e8da3f35eaf7096e33af SHA-256: 621e183c268d80055214322b4c51421f652b32ebb3fb9b9ca334f6eb1a04eba8
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The file's structure and URL patterns are consistent with spearphishing attachments used to distribute malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6939

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://medvor.ru/uplcv?utm_term=hiperbilirrubinemia+neonatal+fisiopatologia+pdf PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/fapurujijetazi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/bc2578b96dfbd7e65164f5c19cea1338/darekavufodir.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090717121973499.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682d2e5d06---mujorekobesarugexazazaves.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m3ugu2gbofss04s6qs7ftm7cr2/xujexenapajukuwazozena.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/30435343235.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/51657254235.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/xugipu.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/35162848795.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/tekejuj.pdfIn PDF document text
    • http://klinok-saintp.ru/files/5967059767.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/63541765225.pdfIn PDF document text
    • https://porfic.com/fotos/file/tafuzudezopege.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/64397900337.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kk1v57v19r3i8rkhana4mv2272/tigivaferuretaje.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195197148858.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/19950184658.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/nexaver.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/48955134225.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/64239754999.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/satimizeji.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/gutivofipobalajojuwuxapan.pdfIn PDF document text
    • 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11072 bytes
SHA-256: cbf148e923169bd410b939c0f9044cfcb086d75ce79a2877e6b89d02edfec72e

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