Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b228644cf12696…

MALICIOUS

PDF

63.7 KB Created: 2021-07-31 15:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d419def6dfdaa2155f2505ea10217e4 SHA-1: 5c437f4386b75acaddd288dceb143a1d1ee0188e SHA-256: 72b228644cf12696c0a19a0bce5c0be6e44c7208811cec8025122baacd2529be
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to distribute phishing content or further malware. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8102

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://smidgel.ru/uplcv?utm_term=cambridge+primary+progression+test+science PDF link annotation
    • http://roland-toys.eu/userfiles/file/teporofomara.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/dcbf7a7a703c38c81a9738035def5567/zutemidu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5f3ab7a739b50cf678fc2b5249c90257/sugekusi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d670e4036f877dd3f8cad324a415c733/61603873024.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b68979054031dcd41e894748061a2350/sulumaw.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/7f9e922c6a568981f3b8a4b73dfb107d/63979137845.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0a74656a---2401563075.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/11987658450.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/59123597651.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93771164079.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6054c57e5---88194012862.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6a2b13604bbbe984d5dccaa917a09746/tarorisubuzitexafa.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jeduzo.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/funifer.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/18791218273.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/71685313988.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jujiwejajirop.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/h43g7d3qcsm7gkrq4dgiu1dgk2/valitedumumudozumuwowajok.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/66845543679.pdfIn PDF document text

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