Malicious PDF — malware analysis report

Static analysis result for SHA-256 50167d416c420e66…

MALICIOUS

PDF

42.9 KB Created: 2021-09-05 09:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20d34478fad2a0293b74404b52635cb8 SHA-1: ac63bb52c11bd6203d99e8206eea531cbf333024 SHA-256: 50167d416c420e6601ddd0bb0edc121ee70ebac07745a93fc5c080f325c0f9d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7172

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://rfychina.com/upfiles/files/16248195282934.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210720_0788F87A15C6C2E9.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/72651313170.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xiximumemu.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/43312376171.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/vakeliganexem.pdfIn PDF document text
    • http://freewest.at/50656600064.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vuruvo.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/tuxawuluvajevomevetazulaf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c4de5beb---52611092528.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/efgpp5gh2l02073dc8n3ppb005/9051258693.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/57124316117.pdfIn PDF document text
    • http://poorclarescork.ie/images/vanokigawufibivitexipupif.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/89215113515.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/popusojozitujonazeno.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624461771.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/97552580764.pdfIn PDF document text
    • http://nensi.si/upload/file/11928958596.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/3626796245.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/zonimolone.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/keroleboxebataxijo.pdfIn PDF document text
    • http://championsview.net/userimages/94502366299.pdfIn PDF document text
    • http://104408017.linker.tw/files/batopuvanibagigisoja.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0c066086---waxobekilamuvonoral.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d7001c59---68422114974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mental+addition+worksheets+for+grade+1PDF link annotation

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