Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf18ac12bb39e7…

MALICIOUS

PDF

69.3 KB Created: 2021-08-02 18:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 858b9f46fad75350a6edce4a0f123637 SHA-1: 3abc7bbf908dba088e6d7fdf60837b67a2e5a3f7 SHA-256: bdcf18ac12bb39e7b1cf9a0d386bc8597b149b99e82aff78f2dbec1c30dddf75
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 external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and EMBEDDED_URL heuristics indicates the document actively tries to direct users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7094

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://krisoc.ru/uplcv?utm_term=cara+belajar+efektif+dan+menyenangkan+untuk+siswa+smp
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hvor34fmanekuugtmb7ors6c5p/jigogoxexawowixujona.pdf
    • http://bandenplaats.nl/cmsimages/file/84786509637.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/pijevuwimujevax.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb24a3e3c---59100657678.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/45966899451.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074742da2b03---70995992155.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562518dbbe---kezoworew.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/81586140177.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/32476779904.pdf
    • https://amrapalispot.com/userfiles/file/40820194220.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/95dde0945cf9ccb12fe0616f509e6750/desigakupirurubatujin.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ed7beba9---mixugim.pdf
    • http://zzliuxue.com/upfile/file///46199774304.pdf
    • https://ivanamihic.com//files/mokeboxaniw.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cd8aa297---872659316.pdf
    • https://norservis.com/files/files/42675469660.pdf
    • https://bostoncake888.com/UserFiles/files/27271615874.pdf
    • http://menafundinfo.com/userfiles/file/22720179312.pdf
    • http://magogaralbamoble.com

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