Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a9e46cbca22512…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 02:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f7bd9a893c49fbd6c1f22656db4699f SHA-1: 19fa3498c38ce369a200b7f1e0f8f6c9eb480900 SHA-256: 98a9e46cbca225126151a271f161c2557c521d6607c86f978fe0ce125ae5ec34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious link farm operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=use+switch+controller+on+android PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614148c24dad8---kurazukatogogirusit.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bebirobova.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210911124524.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/gifabidavunerezetajekori.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/23316002203.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613076d74f023---pujil.pdfIn PDF document text
    • http://ivanda-commerce.hr/userfiles/file/zijuvubawupexukutexino.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fumutikuvun.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/75002207644.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/74826738579.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/selujamasunuwapevevuxix.pdfIn PDF document text
    • http://belniig.by/public/file/41734500354.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133881b6d01f---tuvepositisidegin.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/80805913863.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/33387378607.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425fe8d3679---38460154911.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/desofuxiwapebomugapumuze.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/lebabetapeziwo.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/josulunowimagos.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/zazumobiwajexutamovijo.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/66560861846.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/luxobibaro.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/filoromem.pdfIn PDF document text
    • https://durimawar.com/contents/files/bejenumusifutepoj.pdfIn PDF document text
    • https://vitanov.rs/files/wujero.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/nonunod.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10560 bytes
SHA-256: a3df0a07e09bce235d729d2edbdf103eefdded5e6c07faa28d1a011801b315e5
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 18428 bytes
SHA-256: cdedb92ab24f3090b19c60cd5aa765ee8b636b9d78b84af824bcc4433fbc5f0a

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