Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f848f0e0de99d…

MALICIOUS

PDF

56.0 KB Created: 2021-09-19 15:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20a8310dbf749c1f97b4a1324bafa5e1 SHA-1: c2a53e18596a3b41e04d7d2d10299a2546ab0a33 SHA-256: 537f848f0e0de99da23d7f4dc5115aca6ed781b582daf1e62a649751f85150ee
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8456

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://synerhu.ru/uplcv?utm_term=truck+loader+1+unblocked PDF link annotation
    • http://clinicaveterinariamontecchia.com/userfiles/files/60713851035.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/18310389215.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/p1gcmsiq94ktlvb64j2g4mdj12/kamenejakat.pdfIn PDF document text
    • http://bibikid.ru/upload/tuxegiwuri.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143678c470ec---92075974873.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/11828421596131f5cad641d.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vilulikexelidu.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/10189284499.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/tukisizumujezaxex.pdfIn PDF document text
    • http://aven.su/userfiles/file/noxidinapavexemexuzu.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/jowaguduwexabewe.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/58260714290.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/ruluva.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/dulaboxedo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/53995274121.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/255568230.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/fadevusorusum.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/giwekowiretotalefifebi.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/fejoridubafomum.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/74347633238.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/79262442875.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b66054886---wadisonatupobutobejes.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wixebeviv.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tulesudexixowutowaso.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/gedigo.pdfIn PDF document text

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