Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e402d76a251abf…

MALICIOUS

PDF

63.7 KB Created: 2021-09-16 01:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d84f8ccbaf9c82cc6022b179be5bf21 SHA-1: f7b44bc5176e6e6166f7edf764c117cb7c912365 SHA-256: 16e402d76a251abf2f0bb819ca5a9d8806dd1b97727d5a66323244aaafa0e6cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms the document's structure is designed to host and distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8248

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://allytemp.ru/uplcv?utm_term=android+app+starter PDF link annotation
    • http://silarperu.com/UserFiles/file/vususil.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c9329ca0---45998329100.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614061b4d2dfd---71218570882.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tewofavopunew.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gimovubavo.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/wosililiregasa.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/nudowupasixoxax.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/94251113203.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/puxiwexekupabed.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7ce8a9400ed513513853e3a4011c01a8/jetipasarajafewiguxelo.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/49076938488.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/34934963969.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/bogajujumiwirezafivemag.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614257e6ef87c---11576865734.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/lozeseketisowajadidizu.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/tagurogusigevimuf.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/kifapomazazoniwofanesi.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/kejaxawodori.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/7312073398.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06dc0f516---54165907728.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/89550905495.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5b9af862---rugotukonex.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xipugigodaxegudunuzuwuzij.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/28212848335.pdfIn PDF document text
    • https://revive.fashion/upload/files/garuxerubavixokoviva.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/1951716213.pdfIn PDF document text

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