Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ef538d1925dbfe…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 22:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52c7737050f450647602d06586df0cd0 SHA-1: 49266da0d39f8e4c77aa8df658b474b5ca5a3109 SHA-256: e3ef538d1925dbfedfbf7790e913abd5a0229b6df79a0dcd14a68d8fec0a9830
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

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 https://infrive.ru/uplcv?utm_term=frame+for+word+document+for+free PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e4d258974---55112372771.pdfIn PDF document text
    • https://baongochoa.com/upload/file/70462000124.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/deraginoparipuda.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/xijuxenefafot.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2c9114eb6a02b0c65c7073ede5956057/5524635488.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc11aa42c---60438002614.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904a2e4e346---jiruvopoxaru.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/15051603037.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/7173745953.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/61724079678.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4f20e7e---wuzop.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h9psk9h14a6h4lev2prgag0p93/24200767127.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/jisagalikezeni.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ace27168---11535240017.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2dea285a---30119905432.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b2a4de49---fagetun.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9910bdf8828f8b5ae2ed94b687daa10d/33832498073.pdfIn PDF document text
    • https://papiratisk.cz/soubory/powomafumebezasigowap.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6fcfc7819acfe0172d0b01f7b6990ebf/virak.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/mizodekam.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rawalotib.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2a6c454c---gibofez.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e195781---45914299132.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098524988a0f---dokokuzobod.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9063fc8623792528f90c6e8eb5ba9cc1/vupuneja.pdfIn PDF document text
    • 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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 16804 bytes
SHA-256: 0e263bf58549f7c48e94d801543efb7f687874e2f5f59ec439ea0545e4009ba7
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10492 bytes
SHA-256: 0563f59af54bd90fbed96fe33eeb4652e4ee9a28aeeb60e666639fe1a4d58d1d
font_02_sfnt_off0001300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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