Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5383dfc7b41a48…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 04:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c73c8dd546db1cab9ab4bb49de12735b SHA-1: acfc1cf45812e7eaf10dc65db816a81485bb83b8 SHA-256: 2b5383dfc7b41a48735bf5fa121c43b161c155c5dfc7dffc36d67c09d54c26fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, which are likely intended to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the heuristic firings and URLs are sufficient to determine its function as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5060

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a97492af8d2---94082368298.pdf In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gapelu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aba05a38c2---noxozugowoferanajev.pdfIn PDF document text
    • http://surtek.biz/image/files/20150129_012010.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/detusimaniv.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a7960ac56---dikedu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nj66t5glvun1n3k8qk09bk0j6n/38327941774.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/98588989779.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/82257437749.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/68383432343.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zefulisekize.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060803232015.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/pemononabifiwu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/30175370345.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc41603bd---56836321811.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/7181066.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/kopaxevegiserowofefuki.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/fetoravezesajon.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b084da952e2---vuvujifavox.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l35u7oioo0u25a2b8v8nrbab47/depukegalepabefagotik.pdfIn PDF document text
    • http://allycatering.com/userfiles/347733534.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pitumapomuximuneme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=physical+geography+of+mesopotamia+worksheetPDF link annotation

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