Malicious PDF — malware analysis report

Static analysis result for SHA-256 39387b04650a3535…

MALICIOUS

PDF

60.8 KB Created: 2021-09-13 12:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b51c586e3eda2587dc2781ad37cfe04 SHA-1: c5e68b9285c57f250a988cf87ec0f625f4d9e22d SHA-256: 39387b04650a3535bfec3b5687229ee687cc229fb8fa1c4cd5c095caa26614b5
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. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5048

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 https://etest.vn/app/webroot/uploads/files/fijun.pdf In PDF document text
    • https://orangcar.com/app/webroot/upload/files/36001594096.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/16654550371.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vrvmao5o5tfslp8o81tdq53213/19292050830.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/54675879010.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f59f1b5e5---zevofavovedolujejo.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/fakapimovurulepaneba.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/62681702803.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/xobibejimotasomulotuv.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gevatawejevuredukoge.pdfIn PDF document text
    • http://hadt.vn/upload/files/68613391339.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/fuletubele.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/vujujus.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/83260314020.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/30789071268.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/pimipowid.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908024254.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/89832822152.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/33917523839.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/fiviv.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d7e940dfdfed33b2abfc235f95f625c7/bifulije.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/85356579946.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/1983626840.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/27311487285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=c%23+binary+to+hexPDF link annotation

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