Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1db8f5aa373644…

MALICIOUS

PDF

79.1 KB Created: 2021-08-14 05:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: aa0262cea93846e9bbac33050d32d79a SHA-1: 6668e28c4a70d7a9df09a9c9ad3527682a0c00de SHA-256: 5b1db8f5aa3736448eeeb1c86db835ceba855eb17c39cd8e9d078d7b66e51367
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically identified as a phishing trojan. The presence of external links and the nature of the heuristics strongly suggest this file is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7980

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 http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae6808e5c---50425300613.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b75811f86---29903189430.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa07477965---piwetijugubuz.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/luxodabuwotefunexuzawakop.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8bba504d---61433351873.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/67250711044.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/fd3f35c4d7dd8e6ce694d37311da7522/sopifeduwodoguwexumewid.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/58445411240.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/893b4bb71215467a2d61b53aa59175ea/datuwimetanemomejisobir.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/lunagemesak.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2e6v3aha9s3nj38pt3483d19e7/zaxefidixexekopifek.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489d22c91d---kuvigufoni.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/31538357332.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2qf9m467l033n62fji3ph6sal1/tegewafenogudozapita.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/26379877160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+does+a+lululemon+educator+get+paidPDF link annotation

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