Malicious PDF — malware analysis report

Static analysis result for SHA-256 235e1d2b1b188128…

MALICIOUS

PDF

69.3 KB Created: 2021-08-05 05:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5b5fd157d7603bc9851b1dcad152ac17 SHA-1: e25f2b5c1229b316f55bd09e74feace3d30b0dc6 SHA-256: 235e1d2b1b18812834a4ed9254490945ec0ae2286f1b9fd51550d98479bc5ee0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. Heuristics indicate this PDF is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also flagged it as malicious, supporting the conclusion that it's used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9059

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://madeirashopping.com/userfiles/file/tokoxadafamija.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/relimafomijemonubat.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edaebb4b6c2---98005398698.pdfIn PDF document text
    • http://beateromer.com/bilder/file/15691570854.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/jatukugevotaw.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/68420007937.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nebijur.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n5nreeq0mul00hc18p1ms9f6hf/55930130015.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7e0219d5---didatimikozux.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/ledezepukidetasuwexuvid.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/romopufunogajugexijajirir.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/vusetovosa.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210531013421.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/vogubesutajikoxiz.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xaxurededavosoku.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/tafevoj.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/sokaruraxeleven.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/09a6dc1d8dd2cd0a6c55bc75bff2b243/fojimalokewonarivabedopub.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/27296e1a92f2e33e290fd1367965cab0/ruzodudinapuzominevajoka.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2776ad6d54---53229576328.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9d71e75e5cfeb3a13c8b740692220b02/29994401028.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/zewetixozigoxebixovirure.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fabejapiwimukoleg.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/03de7a7065d1d0dd0348b0bda016ae39/38538372998.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6ad571eecef2218593adaadb7f456838/lojalatobuwigeroligi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=consider+the+lilies+piano+and+violin+sheet+musicPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 10976 bytes
SHA-256: 5b297f23f026c6e5120f170c3fac84c96447ce55f564347664b62774e0910ec0

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