Malicious PDF — malware analysis report

Static analysis result for SHA-256 67104000fe8bcf67…

MALICIOUS

PDF

86.1 KB Created: 2021-07-04 01:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 07a191c041f869ab55202337abee9f07 SHA-1: ca398e85915463885f6aeb8a1109c7b4ee9b2d0d SHA-256: 67104000fe8bcf67fde2bda8c66a471944fa1a360ecbbca996c8d05bc1627c40
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised or disposable domains, indicating a link farm designed for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=freud+jokes+and+their+relation+to+the+unconscious+pdf PDF link annotation
    • https://mecaniquekd.ca/upload/file/pejivuf.pdfIn PDF document text
    • https://hssanesteban.cl/files/73536933646.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/911406b11ebe41d001eca4ca1ac60208/bubasefegulunuwiruzenepix.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/05edb163f826f27d2ec351054c9e24a4/vajabobefafawotofe.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/93639523910.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/bivakiniz.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/kumomuzedonezomem.pdfIn PDF document text
    • https://bloomeng.com/uploads/sovodowekupebugupimuwuzox.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070c896d4c8f---45656055895.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd84954b2---butikabo.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/24505573242.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f2isq3hlkcsg8ukve9vm0rsknu/26671169429.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/21798773476.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607553c780485---83935407755.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c318a39420---sutafimulitiv.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64b48bfe3---jepajimedin.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c5021fded---puxov.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/tafumo.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/34263775119.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jj2k7am44ulrsdj0tgum4su35n/votodawebawetiwesi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vjfcmuoomosu5j61t4acot8tk7/17400664358.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b389c22fc05---kifatubagowidi.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/givoxutesuxesugapeni.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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16704 bytes
SHA-256: df8e51d4baa9b57f44a349c45c83360846e81673a4b9d5cbd6402844e778684b
font_02_sfnt_off00013203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 11016 bytes
SHA-256: 88b94f73959aac0a635d386697901eda680b377a8713368fb3e8ffaeb7eca0b3

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