Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637e95a0f048882…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 17:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07427f4b5fcf38762b8d2132e540891e SHA-1: b5d212720dd5f10119dfa2039bec2507cc5e2717 SHA-256: 8637e95a0f0488821a1d9a075a78080be62eaf1e2f0a57cca80596ac252029f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://beerskiboot.com/img/upload/file/83752819690.pdf In PDF document text
    • https://tavio.ru/files/file/mefajetedi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388283a11c5---pedur.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/39264354280.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/99086245775.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/xisetavutopupi.pdfIn PDF document text
    • http://asid.rw/userfiles/file/69756368329.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/65862012773.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/48492363096.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d4c6821---13129192658.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vafilugukurixatijenixe.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/6124796068.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/duzebivi.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/karulidiraralubusavaned.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/35083112421.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/38592539020.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/42083828720.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/55181820525.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/33392696551.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jikew.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/579a61ae5139324f5117eb3dbe32bb61/83159315088.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/31194893399.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4ed8c6929431aa39ec4aac199d83544b/rerunatukukila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=share+market+investment+guide+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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 18028 bytes
SHA-256: 6a5832eebc946e0cd2aa20841b8bfa1ed08996ac01bd48e88ca22670caa5c9e7
font_02_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 11112 bytes
SHA-256: a8e0afd6a5ed8d9ed90b97b24758cbc4c4b516ef919d9e16f5ee03bc9d036e71

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