Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1d329330d7b7fc…

MALICIOUS

PDF

65.2 KB Created: 2021-09-13 00:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b65be3c7cd9ab2a329be1b0c999d01ba SHA-1: bc730efb2480c613617e7f7e31e0fa9ec87326ec SHA-256: ef1d329330d7b7fc5cd322070309e056cce11b8923aed61855879a60c525a245
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7371

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://marblobath.com/app/webroot/img/files/16322450455.pdf In PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tojunudo.pdfIn PDF document text
    • http://soupworld.de/upload/file/15341952853.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161369543e66e0---19949063393.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dedur.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/pta9nrsajgucq1lbjr7ssa3ru8/megetukafafe.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zulutomukezewotawodos.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/42913617083.pdfIn PDF document text
    • http://synphabase.ch/upload/file/96507338638.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202196347503663.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/29912557349.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wanegomogesafamosatetepe.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dc66de708e23304b65a6b590b9214093/jukovado.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/17406483588.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/bozurivijibakoku.pdfIn PDF document text
    • https://noventa.cz/media/files/file/12981950911.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/499887627.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/61049200450.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/27668421038.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/21402546199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=web+cheat+dragon+cityPDF link annotation

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