Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f2733c2bc50b5b…

MALICIOUS

PDF

64.0 KB Created: 2021-06-27 00:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 68cab8de63c8e8a10cd68e0df97982f1 SHA-1: 7c67359e5da00403ad402c415653220814d5e101 SHA-256: 24f2733c2bc50b5b08206f78634ff2e34fba8fd45f48fd11c110add672df7cac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7543

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=federal+law+search PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/29dcc3d2736c40d7c0aad6a82b92dda6/wugebula.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/859c9952b47d6e5fc49fbf709b075a95/nonisu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3c7ed92b65226bc25cd4127d8e68aab8/bilalalisaxiravatiwube.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa090e563ab---dizetukolevatuveralato.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8cea1780e864d9c3f4f14ad33082c1cf/wurolovuwan.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbcb2ce1b95b602d4c24d34e01c5ba81/4725155361.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/164a7874dda0095ed36210c1bdae3e73/22203994335.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/posoladowizivuzomivu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd2ee97cdf---25001942234.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9fc6817d0092ccd47ed24c8626eda4df/39497551070.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/zijuzigop.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210627_83ED1700CDAFF4E2.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7v001p15p6ncbvqed62slohfko/98347221882.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/jogeluxafadowoku.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768bc69225---nagiwakobusa.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/60750b6a3f63a70cba24337f8f703551/27633953162.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a00cf8c5119---gabewufulevufaguxiri.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c204de85861---66085831300.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/884f00bb9d621992eeadd1ebd408021a/210695534.pdfIn PDF document text

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