Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42a2d9bab30a10e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 09:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c44baeb031e3bf45241725cf157e702f SHA-1: e857e6c9774bf3638f32e5a8bfc5d8be1cecfa43 SHA-256: d42a2d9bab30a10e66926a703fb0fe638c8d9e34be26f305f88dc27ce0b00328
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brlairport.com/images/file/92518891291.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/40503634672.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/02200f59b36cfb71e0c767a0724c22db/98216624558.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219443534886.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xuridabanepitarakave.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/91633359348.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/57015915234.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/robagigonajiguviwuwuso.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210910_020352.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/60083549276.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146dae894b5f---91094282800.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/vakewezekebuxebegabowim.pdfIn PDF document text
    • https://ms01bet.net/contents/files/boxukino.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/fimet.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131055c87c77---ruxitunigof.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/surebiwepa.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/dutedagatunafalave.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/kibatabunumalujugir.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/madexijukunu.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/75070526585.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907101655.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/teposanafevubedumixedato.pdfIn PDF document text
    • https://basisnomor.com/contents/files/44617970098.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5dc384f538481462e946c42977c71b01/nejivudulujuvano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=puffin+browser+smart+tv+androidPDF 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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 10864 bytes
SHA-256: 9634591061363e9a863e11256a9a3ac0f6d998233ae7270daa135e1f45e33a62
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16308 bytes
SHA-256: abc130984a0254eebf2aa855f2fc92410eed7bec4551454203d2f95c6d30f984
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1