Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ef664d7cd21133…

MALICIOUS

PDF

47.8 KB Created: 2021-09-25 05:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ab65a08940815dd8a136dbad285c2a1 SHA-1: 1cdb7ae23b94426766d228ab0e1f38014bcaa75f SHA-256: c1ef664d7cd21133aeab460e289768191788f2c202f0e35e43483f1cce163e96
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5549

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=latest+vidmate+app+2020 PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021090507303773499.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/tojitofugamonalogo.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210915160752_a3kmae.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109242204215814.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bosivebewawov.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/19165235480.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f885e9974d3b3dd64ccec9d63f9be081/gasokulefujataz.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/mifajulilavox.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/jifireremop.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/2831943486.pdfIn PDF document text
    • http://bamila.vn/luutru/files/piwubimafizexekesutifamij.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/70636090950.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/kimekonejoxefugisov.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/gimase.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6fcd2eb443574bbddcdec468c9e22838/zijawalivegabepatenaso.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_2B5A0F1364F563BA.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fitatulubilada.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/pobifumepijag.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mihef8549ohug0m9hikq5kuql5/pegonejanad.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/70054815923.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/rolatipugoniladunud.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/voxafogemetiwefurepaniwab.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d931a588d---pimudopobewu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/batubezaxiligenosesagav.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/nedixusidogopimuz.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/83736224310.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/506ef22c3db326ab547fa75a42cdab0b/50396343520.pdfIn PDF document text

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