Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf457996887f3a8…

MALICIOUS

PDF

58.0 KB Created: 2021-09-13 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efe7d04cebf8102a00e30c9f3ac18a18 SHA-1: 4901a24533ac981a31050f2ecbfde9f190908a22 SHA-256: 4cf457996887f3a864ab71493250ed02a74bacb3588668d32201c81cad2b151a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it as malicious. It contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9142

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://garglob.ru/uplcv?utm_term=monster+hunter+game+ios PDF link annotation
    • http://headrepublic.pl/images/files/7657208803.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/jiwazaluwubuzume.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/mewirugozurilixowakaz.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/rowafanijefox.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e673216780---sijinamaro.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/senafuluzotegubadopasajo.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/89734057573.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/megoputabinefewiw.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/57325133375.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161394b9cc9764---gaduzoven.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/wenigo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/vosomolozalurosibatil.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/zokifudozefo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/goiortul9cc01ir75kfns4ljk7/pefaronipumotukizudawar.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/19272316581.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e03dda28ab8efd4e1d563b7e11bf2a93/63592592208.pdfIn PDF document text
    • https://sadex.pl/fck/file/96303716301.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741351ed73---30364520521.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zikalijudun.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kefegitaduxezusijeke.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/gegonuxibo.pdfIn PDF document text

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