Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a11b86518d9e3d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 08:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 29c1aaaebe8400494c6becf4c8efaa3a SHA-1: 720b3b0551f03cf0c9f2d06d8b8984aa3ffe74b0 SHA-256: 80a11b86518d9e3d3914075ddd629dc9fcf57f5040e1bec2fd3048a7efc0f9ac
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier also flagged this PDF as malicious with high confidence. The primary goal appears to be directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://muzeumkonstancina.pl/attachments/file/31174729973.pdf In PDF document text
    • http://kashima.cc/userfiles/file/nemubivesa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a17b88acc6fcb96f299da02008769845/42458238603.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160741d2d91190---xitolegiwukojafoxa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bcc4eb2cc---mupakegagipizato.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5f354db2dfdf45638843cacc49615332/62626550600.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/86768901388.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23609178726.pdfIn PDF document text
    • https://x-software.cz/data/file/supujuwimekuvisutabi.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jalobusolovomubeju.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0avo82otc8se23tvf4hoq4v52d/84371012250.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fab9e80ac---topuvimujalezigi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/nuzawofetunum.pdfIn PDF document text
    • https://krossi.ru/images/content/files/zukure.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/20381980724.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/97830709031.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/95592074436.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611596e25f300---mozifanodovanipusunifuji.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/66286953006.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04ccee4e92---niboxajudexuporibewima.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/vapukinowedoragajedoku.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/7893860605.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/zogilufisomusalod.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/tebegemopurera.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/godupulovuriropaden.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3144e008---82424931195.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/32b7562cc33d4b5d85194f3c6003e305/28131440590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dolor+abdominal+en+pediatria+pdf+2017PDF 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_off0000cdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 18132 bytes
SHA-256: bda930fbc7660c0def0107f691e3f3fb4132acf97a7a9aa4d7e0bebc8ea5472a
font_02_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 10976 bytes
SHA-256: 95f4a93c3c31327f2caea7b4bb2dda0ba28eb24e7bad219c92a3fca487e73788