Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caf0607ea952d3a…

MALICIOUS

PDF

46.8 KB Created: 2021-09-19 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434e97e3834de6b1a0699a862711c20c SHA-1: 6212d3a2e324c7d6261da9e4840f3ee3eeaba2de SHA-256: 4caf0607ea952d3a80198c2b694dd77c2ee1e009fe45d198aaec20ef898dbdb7
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external links, some pointing to potentially compromised CMS uploads, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8082

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 http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161465993db962---xofenivu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8l5e5bhe3ihopsa4spajlm85j5/tibuvuniga.pdf
    • http://zovsh.com/Uploadfiles/files/melinir.pdf
    • https://egc.ecrom.work/syo/files/25253950304.pdf
    • http://gonganmi.com/userfiles/file/40028108386.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/68613207674.pdf
    • http://beta-rc.com/upload/files/64968740151.pdf
    • http://xaydungphongphu.com/uploads/files/zuzututejepikusomesidi.pdf
    • http://ambvetesopo.eu/userfiles/files/tudad.pdf
    • http://tavio.su/files/file/sexedawawikibatu.pdf
    • http://oodow.cn/upload/file/210911214639151597gbfg7jzupti9.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/24f5768a482e01ab041b7ea2cae487fd/xuzuredulijexajuve.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/tilibizawegukogefufaned.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tq4710knlu4j6f9cgo1im06dt7/nosijujejezawobagufan.pdf
    • http://thankschicken.com/uploads/files/59270073618.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/52292150666.pdf
    • http://transcash.com/ci/userfiles/files/79676595925.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5472bccaf04d5e86db8550361d7bcb15/64549120399.pdf
    • http://aven.su/userfiles/file/61154109018.pdf
    • http://itkaufmann.com/images/fckimages/file/bakilijusu.pdf
    • http://skupka23.ru/upload/m/91923246899.pdf
    • http://pretaporter-pegah.com/userfiles/file/9343625423.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=smith+organic+chemistry+5th+edition+solution+pdf

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