Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cdb5d6ffc2fecd…

MALICIOUS

PDF

64.0 KB Created: 2021-08-31 02:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13d4014a86d58275f70919101c7fae1f SHA-1: cd6cf7f23cff8b5c8dbe89915f1b81258d91aa2b SHA-256: 10cdb5d6ffc2fecdb89ba3f2a8ea012b8697fde6bdacc54b021113a6605dba54
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9593

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b9c4d54bc6bafdbea939e22152a59361/62893294835.pdf In PDF document text
    • http://kxnjl.com/userfiles/files/nivujefuj.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/vaponabanufilavulipuxuz.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/3967094416.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbde341c0---40903868563.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3cqvgt92org8octmerkvel0kg6/46489028537.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a961f31945f---tilel.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/robenugugugegurax.pdfIn PDF document text
    • https://superpart.com/files/fegit.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/xifevotovavojewomore.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/11016951872.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/61339921020.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//43600940066.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/panobezegonevowubuwexiri.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2fb3e7a3---xuzibefujelegobiruveg.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jotojuzebut.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/zavobuwixoxerup.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/24103362386.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/27860269808.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1a3fb4354ddae72757902235793f0bac/51895510221.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xevulagorudilut.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5a72a01cda8747295bcefb1c68c42bcd/99269853328.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/bozevexuledoxajoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+guardian+under+hindu+lawPDF link annotation

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