Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c06d76a32570e7e…

MALICIOUS

PDF

70.7 KB Created: 2021-08-07 01:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd63348c83427f63d9d28be03a943d6b SHA-1: 6465be90b2f54d6d593bc039be8295a6b2b0516e SHA-256: 8c06d76a32570e7e32550f16d41aec622a27a95db376e0ea45ff1210d6d98c14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8833

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 http://ahxxzx.com/userfiles/202105/file/4306939397.pdf In PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/90488775538.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7b4lnhm4assa3tpfub617g3vrr/pinifofopovuwajoxu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5361a4f048---turosekoperevenepifurifuf.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/pusokewabizivifik.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083083761a30---watonexikodifisa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606effccd8120---wazegixoxegogekizetedexa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc8ed5dfb---nurafomefasedaxutufix.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/blkpnrandnqus81t289dc4qpuv/fotovotikutawa.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094656d1ad27---24995502646.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/161c0a10150b9a8f20b66a7c87e6f64e/57347920697.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082eecc7ecb0---24202270281.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd99ee8f3---819232288.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/fc5e797c0082ada472cdc3a0c6907f0b/18127420294.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/fobexavew.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16230277421711286800.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kuzasafupute.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/bajijixonovifax.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/9239406473.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/71677153183.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/40734235647.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a1436d9e6---tibajagekurukazipesefab.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/36466fd5d365f7d15093216e013d1e91/84413719290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=order+of+grisham+booksPDF link annotation

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