Malicious PDF — malware analysis report

Static analysis result for SHA-256 b789a1ac7505a0e5…

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 20:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 60d3b1adf728a1a6b449303048330d11 SHA-1: 3b7c7d0b980b8df8841bfdd7b11ca208d42a3eeb SHA-256: b789a1ac7505a0e5feb3a068448f0ba79f828e22848d154b73239e35181c93f9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=list+of+pentecostal+churches+in+the+world PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eca54a1c48---59036669304.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/sopexurawug.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/vewititededapaxonobupos.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5aai68e3vcbggngml54j1n5tm4/27889664145.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a878d85b6b0---votanuluworutajibowapofob.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/thj77cbeql65o86t89i0b2juh5/56434169511.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4886aba1---jugev.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/07a499693d9bab804edc70f2ec4c48fd/melawusidopiwunix.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ed404ec45f51d26ae90e6b6fc5cbac3/9206677777.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/87092634093.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/pabifa.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/5424233415.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/14516207157.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098a17ebbdff---gulizavavajuratazun.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/90kk0umudlnm81qbgs69m3b0c2/vebonekovererilokunonas.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nutosoxixigabiwowadov.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820bcf25bf6---77474899478.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4ce7f57d3163fa42f89b525d14bfda7d/sibaresewosokijurulat.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210605010324.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a43e24fb4---83356575980.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c0f6927e---87995433214.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xaxufizakajupilodazon.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/1c18d5dadaadfc9408dcb80d3b1b1a16/terivedunapam.pdfIn PDF document text
    • 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_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 10860 bytes
SHA-256: ab93db6ca5aa7077ff9ef362152e805e8e31ca854c9a0688cc527a3a1719eaad
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 17644 bytes
SHA-256: c9aad1d24fe736838d42343f7184c1ff593ddada1c9321afe9320e6474ed1625
font_02_sfnt_off00013955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1