Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4c92230fee4a45…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 16:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2ee0ab92db8dea8b2b10c023a7c7316 SHA-1: 9e00dd9804da2655e7ea13221fd18e90ce25aaab SHA-256: 0e4c92230fee4a456dd2390e44b2655ab18ac42d680eba170f10ed6b17b739d1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it contains numerous links to potentially compromised or disposable domains. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The embedded links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=bodyguard+tv+series+watch+online PDF link annotation
    • http://altus.pl/userfiles/file/wawopadexunijatufobafa.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/16264210762.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/difubijojedujude.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/18098387294.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/12619876405.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/29585638498.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sozir.pdfIn PDF document text
    • https://maria-galland.ru/files/file/84966364601.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/junigugakatusave.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a9fe2bd8---kisusabu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/57420404004.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161341478915dc---12551808711.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/36694599502.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tawomavuguwelorumitiwab.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/816df9322dee64c3215b94ec65599059/wazososekope.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ae4419aba9---ravuwimasavaferepojebeziw.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fawimetuvis.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/malap.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a8ad62a6---22890041982.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/mukuwexuja.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/nuzemu.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/fujedasexasamadipopasek.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/padijeka.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 17464 bytes
SHA-256: 1c2b87eff83ddca794cf7617646dd76b6f9a902cdd5b000dbe219f446405786a
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11068 bytes
SHA-256: c9a1fa8aba6683b11103ee2d3717690e301edd581f91c3002af5cf5d96bcc584

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