Malicious PDF — malware analysis report

Static analysis result for SHA-256 b836f4f5f8fe119b…

MALICIOUS

PDF

63.7 KB Created: 2021-06-09 12:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98be804b4e5a0b54f49db2e3221b0ebc SHA-1: b4564fb002ea8bbbd5c39deffb68eacc278c5434 SHA-256: b836f4f5f8fe119ba9150a71dce86946404702047ad97e240a32328aceb1dc9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan detection. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, likely to distribute further malware or phishing content. The embedded URLs suggest a phishing or scam attempt disguised as educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7442

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://crysiq.ru/uplcv?utm_term=go+math+workbook+grade+3 PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fefd0f37ccc8a551c2a8cdb6e0e1d333/lizodagujusijidelazowelu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b26c0efae---25815445019.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1af150407---26403919677.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc5a3044d---63651474604.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d90e2b8e---35154085663.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7gthkfaoalbbe86fa3lhph08f8/nibepopazopiwuvit.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bfb589f6a---perizuzimixebakomutinumak.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e86063298bd13b23f69818cb64184cef/lizekulededesepagutobef.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f90b0ea9---lalidi.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/335de435fe199cfed8525320a40c5c53/kevorunave.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/efjaehhmvl3cs3esk3rsdbvbsb/62801441248.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/92844230370.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/jupowojujafomilu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/57cc90d10cb305c6430aae828f041e34/43428072035.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b55733e89---bivumotojepilog.pdfIn PDF document text

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