Malicious PDF — malware analysis report

Static analysis result for SHA-256 affd0dc675783c6c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 07:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d0e48a97baf1f918a76c6ccf7d0cf25 SHA-1: 210542997de44acbbb492d191556b4330bc16563 SHA-256: affd0dc675783c6cfe7caa8cc3255d068234fa1f309540f12b93063daca629a6
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated, but the presence of numerous external URIs and a heuristic indicating a 'link farm' suggests a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=rpg+maker+mv+player+android PDF link annotation
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/96977133049.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/suvomofudebixazujemusimi.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/vedusuluwirulumefuwu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/bomepiduxeji.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/61018397029.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/jivijirinowivujokizeji.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/guwefuxovefelix.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/74622523459.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/39798499426.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/wurosulukukadonixelureki.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/29337423201.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/50401767385.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904152714_72045357.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/62589932599.pdfIn PDF document text
    • https://12shio2.com/contents/files/64225987595.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/058249bec87b1a2152937abca1f2639e/83902235523.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131961d1ec68---katepujo.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/43542071604.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/soxirupaz.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b25cbcca386c92dca39ee4c4217dec92/38567235463.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/95817869385.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/97631758661.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/semag.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/kegurosonitapujama.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613415aad774f---56008402665.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_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 23972 bytes
SHA-256: 01774d1d7e3a2ab4b44418eeb2860d0395a060334079d065fd6eba670e40c931
font_01_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 10784 bytes
SHA-256: 85adbd4c31709e99e1aa4179033b649438b90b2163acd3879ef61072e48e7cd7
font_02_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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