Malicious PDF — malware analysis report

Static analysis result for SHA-256 033edb579553e799…

MALICIOUS

PDF

50.2 KB Created: 2021-10-04 13:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c81ff93630f2953a43f6afbd11b69714 SHA-1: 092d0c0eaeafdf43330a708a1d6e972a33fb5bb2 SHA-256: 033edb579553e79961b0869edad3ff85c4fcb387f079b0446b2dc501c78b3bd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

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://coretry.ru/uplcv?utm_term=what+is+endothermic+reaction+in+chemistry PDF link annotation
    • https://gencerenerji.com/resimler/files/521743134.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/24689536727.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zekipuribelukuri.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/puwurupevexisovegitegoz.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/wigosererasizemarupime.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210904060531.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/13448826035.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/56740690751.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/233801d5788930e844f86026850d17a0/84092652564.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kateg.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/nepufotukukifatef.pdfIn PDF document text
    • http://bscartridge.com/pic/52782719927.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9f7936102---visolubixanopesuzi.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/sexaga.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/50535845072.pdfIn PDF document text
    • http://vo23.ru/upload/file/98538737792.pdfIn PDF document text
    • http://adanamega.com/userfiles/file/golorexuluzepug.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411ff66f327---miturutasivelef.pdfIn PDF document text
    • http://klenderbio.com/upload/files/65709555568.pdfIn PDF document text

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