Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d9a275cacd6b6b…

MALICIOUS

PDF

88.8 KB Created: 2021-08-11 13:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: af3d69f1f7af4af3f55ae77463765af9 SHA-1: 80517d13bfd130bdb13b378cb489539ed42630fb SHA-256: c7d9a275cacd6b6bae4af0240d63aca6760c68ae5446ca57e9698545fe7adcba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://arab-hams.com/Ups/files/57896117887.pdf In PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d832a49b---74572096335.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/39938412328.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4d6a251d0abcde487f61cf4aff336a59/xewowuludalitepobagug.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160977695f139a---xikozujusaxivegudaga.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dedekagevupuseva.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jukogirosogipudog.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kebojibakonazuxemikep.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/l8ll0itbsq01bpgj20od7g9rvv/1400009454.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b245bf5c---52804575762.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5ee8fbb8106a322886aba3ebc327e46/70422361295.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/91726319448ce743cdeaa0607c53d33b/97709775423.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/nenivegatoto.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/62575122888.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/57328596713.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b52681d988aae97b1b8bef860d470c6f/3062474935.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7c3aa8bf8ff6da691006c86d2feb4229/tokibipuvu.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/22131601197.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81137910578.pdfIn PDF document text
    • http://yilip.net/userData/board/file/56382080210.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/388683c9b006d54e1f6035c6fa39a0c0/jakukodoju.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0af3928---95884210028.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/gobewafikopokilupulaxu.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/76296946780.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/57645902169.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jepulamusisus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=%D1%80%D0%B0%D0%B1%D0%BE%D1%87%D0%B0%D1%8F+%D1%82%D0%B5%D1%82%D1%80%D0%B0%D0%B4%D1%8C+%D0%B1%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F+6+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BF%D0%B0%D1%81%D0%B5%D1%87%D0%BD%D0%B8%D0%BA+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 22100 bytes
SHA-256: a0006016eb0ddcb5afb9c9114cd3c56d50d6ef5c95c5380d3b7e63d18a871c76
font_01_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 11500 bytes
SHA-256: c269a59df5b593cf34328f09c09c836f99e55d0451ab5768a9aa3e82ffc2d136
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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