Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade3dc45c2207123…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 09:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a17f2ada84aec4263aa22afa59666be SHA-1: 8744d226bbe38bccbe91fe099ec61e950b84de81 SHA-256: ade3dc45c220712357e3339c96b94362feb35b83545b21a3b8110146b4aaf000
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many pointing to compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=pdf+default+app+android PDF link annotation
    • https://egokituz.eus/files/galeria/files/1265053942.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/vewomogununijusujusapo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba7064764---15950342476.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/lawukivogigavubepa.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/58564237952.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/56748943992.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161367c22893f7---zanesumamefojozobinojinuv.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/jitulupoju.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/rutimepapirozutozavubow.pdfIn PDF document text
    • http://fitviewer.biz/files/file/86084637589.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/pilabiguxovakavubufabagif.pdfIn PDF document text
    • http://bastola.org/userfiles/file/zonoti.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/60486566942.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/befosuja.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/afedf3b63012c4bf6fc076fbac831b15/towejonunevisidemirebuji.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/43763312288.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/64086217722.pdfIn PDF document text
    • http://imoroz.by/upload/file/10946855675.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d7a1e718---72772285843.pdfIn PDF document text
    • https://emenu.hu/editor_up/47506230274.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/sonuneruberavibejok.pdfIn PDF document text
    • https://sapporopools.com/contents/files/99483743815.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_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 17180 bytes
SHA-256: 702d0dbe3699c37cff91f3869236d5566fd0374335978400e9f72f2a0b064109
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 10424 bytes
SHA-256: ff867ee2289155a014e576147a5ec006f1158c6a30dcd47270c279b4a346bccf