Malicious PDF — malware analysis report

Static analysis result for SHA-256 e428bbb33ff17ecc…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 10:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8799efb927acdc697be6da3dbb1cb7e0 SHA-1: cdcf9ddf98a013e027c2ed3edeec8a688d75ed03 SHA-256: e428bbb33ff17ecc0f44d48843c864f20faf6bcaa1d112386218c2bddb7c9de3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a non-clustered link farm, likely for SEO manipulation or to host phishing content. The presence of external URIs and compromised CMS upload links suggests the document is designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4701

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://garglob.ru/uplcv?utm_term=inshot+app+to+download PDF link annotation
    • https://magerp.org/upload/files/14930245588.pdfIn PDF document text
    • https://fond.ru/userfiles/file/bebefedu.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/83334447103.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/bewavobobovijokukamiba.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/98372561406.pdfIn PDF document text
    • http://congtyvima.com/images/Download/dafirotenevenelewutezaru.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/47419946856.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/1519895659.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcfc481cf5---kunuvaxuzukofowinawosiw.pdfIn PDF document text
    • https://fong-cai.com/upload/files/fexakeremodemitixekesi.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109200214373555.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/14526702968.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/lufid.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7ec64b128a9c870d3caf4c3f11e140c0/salifeduzoxako.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/50855861741.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109051848481756.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/tarobiliza.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/70680372576.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/busopi.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/mutozinamozowigomu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/831fcbfcebf4988a4d88b4dec5063196/35540279377.pdfIn PDF document text

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