Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd61d861eb2f97c…

MALICIOUS

PDF

96.0 KB Created: 2021-09-06 06:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b49b7e0372e8d63b8feabf64984eadb7 SHA-1: 246948c598ca7b028e17deb857e0a86f80a72645 SHA-256: 1fd61d861eb2f97cb5ce004899f6c959afcd743e94be9b98cc9f12ba0b505696
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic firing for 'PDF_RANDOM_URL_LINK' indicate a malicious intent, likely to redirect users to phishing pages or download further malicious content. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3837

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=kodaline+high+hopes+piano+sheet+pdf PDF link annotation
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/81d7d3bed1c66ea0e1753e42e826ba3c/saveweg.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/galejadarek.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/17749074311.pdfIn PDF document text
    • https://wumusk.com/asset/uploads/files/lexemirebivuviribopot.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/2ad1096a69d1483cb743d0b5d8b1ee1b/sorutonowege.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210808212512_12z1m5.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/itj9r6a1n1dm66jl5d9k0dq5ag/fesiwuwumasal.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e89ab948---lifumurerafalawenavo.pdfIn PDF document text
    • http://camwater.org/media/files/nalad.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210615230523.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b60cbfd8eb2d678ae40ce95e7236febd/25963142547.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/moduzexop.pdfIn PDF document text
    • http://school15-tyumen.ru/f/pewotisavasirimemur.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/ziduvim.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/60650910990.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/1923335788.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/xokojipifuxesogabebi.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/899040121.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/bf9663f4badd6ec5e73bc8c67832b578/pepilewakasukaluwujeluzur.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec6be0c5dd---lomudigafezuvewozu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/62997635034.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9db73f09a---tevunerabuxevurulesitumet.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mjb9k2bimt97phr0vgfbc4pgkd/femasajogesuzegelu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/95978236513.pdfIn PDF document text

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