Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a18eb83c256abe6…

MALICIOUS

PDF

90.1 KB Created: 2021-08-14 02:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cedcf0ed6eacd3a1e2ebabd3e785331a SHA-1: 904468c0f0f9c641a090ec583168b00fd2178b21 SHA-256: 2a18eb83c256abe62c80771815f1b8af8bd189ea7aafc645688685bc707b9de3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/628335bef789187f89460b6431484d0d/7360132621.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094232e3346e---giludo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/bugisutodudisoribev.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/a5h0b7336jvak0upj09iomv001/jewuvuxiruxe.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/takikixuxajijatuke.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/33072409473.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0fb2bf6f705bb30a3195439666c6bf82/66818045022.pdfIn PDF document text
    • http://pololanna.com/user_img/files/52709345176.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/disex.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa0cd9b1f---paperumawisimodofufu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/do62j95kc8528726nshhhsjao2/55446027459.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/vesevafasurufotufiba.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/92221307047.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7752c1247c---siron.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/pikurudutida.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/20732797376.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/89n4q7k2rnuv7idvgl2kepg9el/wibiramodibisuzibito.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfe15db5cb---wunewegosimizotudojerad.pdfIn PDF document text
    • https://eternalbliss.net/file/sopawagazod.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/mesonu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2faca66935---ragos.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/37878982366.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/49479382955.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/50934699297.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gomanoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hill+climb+racing+money+hack+iphonePDF 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_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 17224 bytes
SHA-256: 2d3a6b25d6f620cafa351e5feaa646050c4f9d390a302eba7a7ad9918ff6db33
font_01_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 10892 bytes
SHA-256: c7ad921ba67528811345c91312f38d48aaa862d54b095daf9f6998e4340b42b6
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1