Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae32a2cf317745a…

MALICIOUS

PDF

79.0 KB Created: 2021-06-27 00:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 313a5ae84edd03424154be33974d175c SHA-1: 1cdb0661b5048564f1eab4acbf9d8a0548fb1113 SHA-256: 0ae32a2cf317745a17962aacd2aaa95d4b6d81925a4bf34261e236e33f03c6d0
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm, likely used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/71734886df8310f4c2c640e5f27a766d/loraxiviwiso.pdf In PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d3151e78---femukatepodexiloxos.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca3704bff---fizifuwurumiveduvuwufuvad.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086145da8b65---53198451887.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xelixaxifezopevan.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a591500691e95b844969cdcf85562b83/zexoj.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdf7d346355a36d2284321dcc7539b07/pigexadat.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd497460e0---11989182773.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/8544ca7de720dedef8853de8ccab7c63/24643854847.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/runurinonekapigazaxak.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea9b24190---nigebufosam.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83eeaa09d---28471050605.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/giwiwezafixav.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e53c34fd6ce8bce3d0661078f08efae2/tirudezapovetulaguzuzegob.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b1350d5e6ffe86c96aa7ff8300913861/81302781770.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/14798027812.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/jokikojunalesibafe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c759b5fafb---86223572560.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec2576f565---76528289474.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/gomisowom.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wifatemu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6a89e6ba---porelofokid.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce91eb148c---43933597665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bisection+method+examples+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A7 17036 bytes
SHA-256: 38e63ebac94b4a0d8c1ffd404779b316f95f59e803c415353968c7ed11491f5a
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10940 bytes
SHA-256: d0c2ed01fee630c3eeaf3aa4318fb7abbaecfb2ee94499d692cad914f941b430
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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