Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0613cf4c09cc2b3…

MALICIOUS

PDF

56.5 KB Created: 2021-10-10 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61d94115e1f4d837f1eab2396a2c7aec SHA-1: 3dec8966a37a69b2d22503eb2a1f49e06c5e9155 SHA-256: b0613cf4c09cc2b34495290f602b14f853eb7132ab74b8d9e1cf11a855a4a341
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6212

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://queure.ru/uplcv?utm_term=what+is+traditional+fashion+accessories PDF link annotation
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
    • https://sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615926823f38b---58645128245.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/fanupazunimowudejubikubif.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/degotetikug.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tiperuwogudogu.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/merefuk.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/figenilidamojivasujaf.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/56988989516.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wimikikatowufenip.pdfIn PDF document text
    • https://badrivishal.com/media/nekepivakeniwidu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kadosow.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/40324505301.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/ripusolofa.pdfIn PDF document text
    • http://prestopc.it/upload/file/94009413971.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/95756760805.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f356f71f5f---daralir.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/kepopoxom.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/54681815284.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/90618006095.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/teduli.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/39282689061.pdfIn PDF document text
    • https://dellrein.ru/content/file/27607422604.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mogedixanomufe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5a1a68b67---wexanufisineto.pdfIn PDF document text

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