Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0f5e340f6455f2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-08 00:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 839be34118d142fb326db108a1c0ae5d SHA-1: 91e3dc9223cf1f099901c893706fbb03d8d188f3 SHA-256: ac0f5e340f6455f2eb9fe94d770299485ba7fc91a88da8b5768e0c0a0c693045
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sushinamu.com/uploads/files/nogomakukukeli.pdf In PDF document text
    • https://sealskinz.ru/files/file/timejifumivuvol.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/a85f086851240b43e13c06b6deaf2fa7/61530255604.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/zimer.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161070e5a6637a---82610080273.pdfIn PDF document text
    • http://otczenacts.com/media/files/niwerubeluzedofobuvuj.pdfIn PDF document text
    • http://rubensova16.cz/files/file/xabolebovimiru.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f00cuptqvmitemifcop89gfht4/69610025922.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/70450313455.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8b7264a5---69409805579.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/91376819755.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d0c6e13---pijigamopoliritakiz.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/80662870470.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/wiraledagabebekidolofup.pdfIn PDF document text
    • https://invest.pl/userfiles/file/3534479560.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c28006da7---13735191292.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a715a80dbe---85761471934.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/18567830230.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91051717536.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/85ab1e3219f123ec45489261539c115c/rirusixab.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027a301da5---bosepinunozomuwamukiv.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/21250539321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=glacial+erosional+landforms+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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10724 bytes
SHA-256: 20de5ff022fabaaaff5e929d8683454328204c1c23c271d8d0b06ddf7d89a676
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16604 bytes
SHA-256: 6635ea39dfe63d1585efd2aecbd3774d82aa03924d55638bae6a822a66e26465