Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a58623d8a6a05dd…

MALICIOUS

PDF

141.5 KB Created: 2021-08-14 11:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 009fb50c28ab76a7cb234abca4e30b75 SHA-1: 531f395a489efbbf77f8a645d698c667a817ee8c SHA-256: 8a58623d8a6a05dd46b511d85219662ac8a4308025b0f2d763aced0dc8fb7150
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9418

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://abicecream.ru/ckfinder/userfiles/files/99521706193.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3733b17a---mexipujamulotataxuti.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607df034a6f4b---junato.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8cb98ad6e5999738e53ebc0609c6fe42/gebiwetilinomul.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wawujov.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/39516549123.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609697f315d5c---gufifosijixigusogopu.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5056728599.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mogezowexaxareku.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/91712922134.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/fegovubekizexanomimubapel.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/99572418123.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/21263007152.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a929c00780b---pofumijepiluzog.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o616pg45hq5mvevt3t4fi7gjh9/zipimu.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/44852977575.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/nomogovabunugavowodokale.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e2f7f5d1---79883271252.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/vuzajubu.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lanazekirudexasuja.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/131cc6d1a09c550726efe39ab0963deb/boxetonajebajubibepazune.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sedijivexixuxobosax.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a06903032---jovew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=prentice+hall+algebra+1+chapter+4+test+answersPDF link annotation

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