Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b99426fc076a0ff…

MALICIOUS

PDF

47.7 KB Created: 2021-07-15 12:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ea89d00cde5a159f390ef5e886ac661 SHA-1: b5adad74d13c9c41c7fc2d4e0351cc5922aaf1cd SHA-256: 3b99426fc076a0ff613b13cd6c76bc8451546b1498b6030f4609691f2f50018c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7378

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://chcial.ru/uplcv?utm_term=best+android+mobile+ringtone+download PDF link annotation
    • https://mariellatriolo.it/public/file/sibunusudumojo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/ponimujumugitazada.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/78884338950.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e315c1ca119---10307124614.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/zugolegezegepazag.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/mixevepovuza.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/8784353664.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc948144f4---67169899059.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/94628539995.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e7435adfcf288178e5d1e29171c5fee9/10509288483.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079925429d4d---pezigifugukogawijefiwaxel.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/mobabatedemujituwozivu.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/xekajetigusozet.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uos2ulj2mio9uq4gq1d01fbjfb/62434756733.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cc23a9867---14837055455.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e74ec5c008d5c8a7770ed781d2599492/78272012626.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0jq8bufhmv29ir548cbmt9p290/vipidabo.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d70a8ea51f1ad739f538cb8d3edd456e/68537012259.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de93a77c902---99360993744.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d29f4d9bfedda8ed6f219f71cf16ee29/gigafuwupepuvako.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b6ec7594d---gemogogitosamize.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a143572a---pivumedoreda.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8bbb8a99c---84729341379.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/sigajaxufemimeg.pdfIn PDF document text

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