Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4a3230d5301f15…

MALICIOUS

PDF

57.8 KB Created: 2021-05-23 16:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ed2e0b29f284d620228be68cceae872 SHA-1: dd6deaea079a642c1872d3334c839ee9f473c6d1 SHA-256: 8d4a3230d5301f15c20c4ca6b15cdff4fc80851c185b9913bc494da0fb47dbc5
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, specifically leveraging WordPress plugin vulnerabilities for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or phishing content. The presence of a link farm on disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21a1a5646---ginuv.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e229b44db---luzas.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189ed709dc---gakavunojufowe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fc5cc91e96f12d1d9df61873120d5fa3/26075239275.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae35f0c86---wuzodopunonupuxoxito.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q4v04hbo4ji5cbqgfo4rg2kvpn/35677549180.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/60152735815.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1aba1118---pavizewamowu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c4f69484---gasobulubimifarumugexanob.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/patozifak.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/aoaiq982071h7lcv2vcl7rvf8r/pabixoneveze.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c392f8dcff8a9a3e2ff1350a7d238144/xilijorexeziwul.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/fejigisaru.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c6e88674---pepufepadode.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/99534976720.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d05c97f6---68898411475.pdfIn PDF document text
    • https://agatanorek.com/files/file/jotixofegevopejubi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/69e45546a5099320b528f19a1ff48fa0/nuruwejotuxadubegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sizzix+big+kick+tutorialPDF link annotation

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