Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4cca678d9ebada…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 15:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f70f6463425ff48211b3054a7f800732 SHA-1: c6d46ae557f8e27f24df58b80ed0404e4031d48c SHA-256: 1c4cca678d9ebadaee06d522d7b6e315ded0d780c96209dccfc22d4feee9652f
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is unreadable, but the heuristics and URL analysis clearly point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9174

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://saikekanglun.com/filespath/files/20210817044842.pdf In PDF document text
    • https://nhachoxebus.com/upload/fck/file/27630319151.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/23802125876.pdfIn PDF document text
    • http://nincity.de/inline/file/tanekaj.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210802_28BA42147A141585.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/42301686177.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/bawopupurodovokizabubo.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/68552969433.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/86486841553.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b749cddb232---18197111390.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/birema.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0877f2b4f---fefewifovowagezikuj.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/72e58e45032e239fecea898c91071a1f/gumejujuvub.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/42317693147.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zagipedu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/12590196758.pdfIn PDF document text
    • https://stopserv.ru/files/file/duwadunixapet.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/wajexilurotobagalabovuni.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/g2regjk9dc8oiq6s1cl56lq8ae/93747510816.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/vivepiv.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/18186498819.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/83665cdb9e98f4cf119f064e53fe5a14/88909021720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=web+scraping+with+python+pdf+downloadPDF link annotation

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