Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fae0761f8408880…

MALICIOUS

PDF

59.7 KB Created: 2021-05-06 12:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 99afe81061922c85d1d46ba4c5f7cc3e SHA-1: 21bf1fd430edcc0ea9a8603153e5d29b22ee40e9 SHA-256: 6fae0761f8408880da3807a6e5a431bffc1425f0c3589e76e5d8b8888927aca3
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8773

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://oniceh.ru/uplcv?utm_term=cfa+level+1+2020+books+pdf PDF link annotation
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f83a3466---lekubigefenej.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ii2qb5ilcu5uc5bgjcfu60b4in/resenubuzikeb.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a30a75c8116488a641e0915ed59fdf23/sajativurelunomul.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnde2vbevvb1n12j2988aeikn5/ravupuvaniju.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/63777499863.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be71557308---61237961323.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5belkj1l6cjknr3mmugkh7qrv7/zabavo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608864139b2be---fosikuxafetirixituribagid.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7215d528893231472337131bfe5879a8/rugetejajuxafinulitiraza.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/481dcaa63a09b7759f39f7baa7ab5ed3/nigujopizazamudesigulare.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8a8d3fbffb77870c1a97e210ebb9008b/lexilulapunojopuverurume.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/734da06a044bea0fed0d67ebdc311dd7/50197710269.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079dc77a2d79---14650056234.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072604cf37c0---vapebudugojupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edef614f25---womesotopedotejod.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ff7eb326---28443951409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 5432 bytes
SHA-256: 90df8a6f8983ca33a7ae7a917e2c6ad855a1681cd789fda20a603896635b3dca

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