Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f556d5b017dfef5…

MALICIOUS

PDF

48.0 KB Created: 2021-09-14 14:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10e3b23b7ae8c87d47523b72c466268e SHA-1: d1c26b6ef1ba5214f7e64a0282d3157f808e4cc5 SHA-256: 8f556d5b017dfef5a65f86d7f8fec44236d81fc6a858e9136fb94b5e09428633
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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://ketchas.ru/uplcv?utm_term=how+to+put+music+on+my+samsung+phone PDF link annotation
    • http://laskod.hu/userfiles/file/zokanupotuwutiwubezuleme.pdfIn PDF document text
    • http://e-sheremet.com/img/6406079532.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9367e106f---nimarujojiradaxed.pdfIn PDF document text
    • http://afslab.asia/upload/files/menovefabazomikoreges.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p9bqvhek0d39drdk87atl7l67k/vifuduwitusebupitexe.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/21318519144.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/12016833259.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/1296162714.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/wobimijatisejal.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210906_FAA856AE2EF6C62D.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/bafelimugozomas.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613512082f175---zarekogenuma.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/doxezotobeki.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/67186358399.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/sifoxutakemaxofuwubogu.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/wonaxori.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4d070486b6cd78d3d27c0005e0582a47/zokob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v8k912q1l0ssvgokpg75ph9kt5/72561259040.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/55772760440.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/92729192337.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/zojofidinitoloreditos.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/netufixak.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/35843470290.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/kupaxerex.pdfIn PDF document text

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