Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38871ea7f353087…

MALICIOUS

PDF

50.3 KB Created: 2021-10-04 19:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0770af35226ec8feb4d81ea66c37281f SHA-1: a9dfad709a97f8d10c577046aff1b0095687af27 SHA-256: a38871ea7f3530870773b8e40a3bc9f049b3dfb47157e5bd7bb9c4c411233d4c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier also flagged this PDF as malicious. The primary function appears to be redirecting users to potentially malicious or compromised external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6227

Heuristics 4

  • 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://wastran.ru/uplcv?utm_term=hebrew+year+5781+meaning PDF link annotation
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e28fdaae32b6a200db07a32a8faf1030/43969772772.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091719263157514.pdfIn PDF document text
    • http://gespk.com/userfiles/file/13157533381.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/77819381985.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vadixeda.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kenefopuniredufagixod.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/68803788165.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/pigose.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/witoxodegogizosupudeno.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nikaxuselabusifamelaz.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/vumipuporap.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f5bb3dc0f---69995743698.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/fobosolinaxuzipuberoxaxo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015e9e5b66---kigabavalezuvifumet.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/43343182037.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/wowir.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1c8cf34f8---modefi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/filagifikabug.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907054540.pdfIn PDF document text
    • http://cissi.it/userfiles/files/81392495977.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/nojotuvox.pdfIn PDF document text
    • https://ww170002.linebot.net/upfile/files/20210929052945.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/ditamozaguvesi.pdfIn PDF document text

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