Malicious PDF — malware analysis report

Static analysis result for SHA-256 1972be16b95d643b…

MALICIOUS

PDF

51.1 KB Created: 2021-09-17 20:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91a01a01b874d4106217516c2477a096 SHA-1: 06bb85bf5442cb316271d0ba16eb0f8b34b38d2b SHA-256: 1972be16b95d643b1959bdc68de860499c7252471228cfb6cec97a522721b859
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosting PDF files. While no scripts were explicitly extracted, the PDF format often utilizes embedded JavaScript for malicious actions, such as redirecting users to phishing sites or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7719

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://ocw.tw/uploads/files/65746174139.pdf In PDF document text
    • http://bluebossa.pl/files/file/44159178933.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/39432457114.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/67718626373.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f20eccea3b---lubumupuxogifototaderoz.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/33142270229.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b128097---29339394799.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15065694852.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/40545154458.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/47767777319.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/pejipemobilide.pdfIn PDF document text
    • http://e-hematologica.com/users/file/18233161275.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/98719293427.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xuvudukak.pdfIn PDF document text
    • http://skncn.com/u/files/86889453912.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jovozogomun.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cn4rk3bfn5s2k8hq13cgnc3d36/xofof.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/66914730437.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/84131145626.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/88289611840.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/bodipanefaxuwime.pdfIn PDF document text
    • https://maviet.vn/upload/files/35016465516.pdfIn PDF document text
    • http://budropol.de/Upload/file/mupadijutuxanoziwobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=power+rangers+legacy+moviePDF link annotation

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