Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5960abbe4bd0585…

MALICIOUS

PDF

56.8 KB Created: 2021-10-05 08:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5ee8ce278a77883ce1c960d185456e2 SHA-1: 2c17e70537026453eee2cffb900e8d9a53f56dc0 SHA-256: f5960abbe4bd0585078e07603f2ba1fe3f0619a5a06eaa2941a1f03f0f71fd00
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised WordPress upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4703

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://krisoc.ru/uplcv?utm_term=meaning+of+reinstated+in+english PDF link annotation
    • http://mastervin.ru/files/file/ritaxesez.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919041623.pdfIn PDF document text
    • https://abss.pt/userfiles/file/sorofimidoludafupejer.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/domokosesezumijukitowaxej.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/ef4532c739c86dbb5ecad6e050b2c748/93689656045.pdfIn PDF document text
    • http://zamgph.com/uploads/file/230750228694.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gilirimexavo.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/66572356376.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/filikak.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/71210494297.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/310f182e1ec8ab763816e31a8c453a58/94436807030.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bec7033d00d1909b8ece98e64d3ad791/20806218865.pdfIn PDF document text
    • http://mestan.by/images/file/zuniw.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/numunepinibejebidi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/73405930459.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/7512535248.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/4527013912.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161534a205f203---sivijum.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/sogizivijoxakozaseviv.pdfIn PDF document text
    • http://irinabailey.com/upload/files/ximesapuwupijeromixowoge.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/11247e0afe3d5b315883423ce26d86ac/1260203076.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/16658524273.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908192902.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/faripos.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/pifuge.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fafetedupoge.pdfIn PDF document text