Malicious PDF — malware analysis report

Static analysis result for SHA-256 643c1d86d77c660c…

MALICIOUS

PDF

54.6 KB Created: 2021-09-06 18:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f342c52216e8f74118f61a4abacb94a SHA-1: d4c818e1d973b02843d938302aed19179c269e71 SHA-256: 643c1d86d77c660cf8d8c64195af2c4386914d19356888c51e5ed1ce7437631c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6962

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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d7264bab3176f5a64fe980e2ca22f4b3/vitefopakogetipi.pdf In PDF document text
    • http://berbun.com/user_img/file/tozitipixepiwuwekefopesu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/675d7283b557bd49be17a857d7603298/32185896871.pdfIn PDF document text
    • https://robertbah.si/files/file/2189724446.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/bedimigawito.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b080cc2116d---pajokijiresofonido.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/84029352951.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/71070606551.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/30043594959.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c5ad8ab3---tuwigekelulasujofew.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/terireranigopidexumo.pdfIn PDF document text
    • http://learningkey.org/userfiles/35533369073.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160729e1201d6f---96160410567.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/95128807366.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/minutofinamekifo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb45c0fc5a---19378601708.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/59257471802.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gatofu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a4ae353a4e8821efeef03b91a091c664/vufegef.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/59256337539.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/towixukuj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/da767e3771f9346fb95171238dc4815f/xezuzupubutiguredamera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=deutsch+intensiv+schreiben+a1+pdfPDF link annotation

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