Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a51fcac93e7c2d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-14 09:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1cf7e1292ed4421b6f6ddd167639154a SHA-1: 0bb42d8461ccdcf610f31bdb34843a9f6b37bb95 SHA-256: e7a51fcac93e7c2d5273eaf5fff452e59618ebb7bec89c1ebd211d327a62f392
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, directing users to numerous compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the numerous external links are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kapli74.ru/upload_picture/2751711552.pdf In PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/87228976d1b83f5d26bab10ab1f06f0d/fonobezogomopitajedego.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608436ff907a9---91524942108.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/jefevurebazekusato.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/apj9tdcrkiffplcr1pjmlon124/89602207758.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94833bfe4a---towox.pdfIn PDF document text
    • http://ropesadventure.com/d/files/40340012310.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f2000a220a286b1b8431c0486280ea2a/23152791805.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fda445c40b976fdd177391dc8a59cbde/ganibutax.pdfIn PDF document text
    • https://akvaguru.hu/user/file/junufivom.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/dokugekiruwarodesopizebul.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/55603200341.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/virizekedegoridefewe.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160931dd806b23---98071901969.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/jivitipujofesi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/11651181012.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcf4bc81f---14700231226.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5suv275e8qk7r8ji622vf8tin3/pudes.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/494d206ff0729cc0693a458229785823/63526911167.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kifolepegipefujoxifepo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9087dec3---53360117112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=darogha+meaning+in+englishPDF 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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 17888 bytes
SHA-256: 201ad5287fade5d6602d30bcca8a322810c7ed8a5aa51e1347b8da2b16e4dae6
font_01_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 10460 bytes
SHA-256: 758ababa8c2d7d35a9239daf951493977f7087e20691ad8b3ed9a5e1d9cedc28

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