Malicious PDF — malware analysis report

Static analysis result for SHA-256 a028bf5c37cd196d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 10:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2dc3ccaf452d4ce2f31a0b0b455327 SHA-1: c5eb95e4fb8ee806641ae00df36cd8457130417e SHA-256: a028bf5c37cd196dfdbb36027943dedf2436e5db425ea4cc6bdafd67b316c8b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=critical+care+medicine+review+pdf PDF link annotation
    • http://orosweb.hu/ckfinder/userfiles/files/17699446857.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/81747827691.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5871c1072d154315ec012c5b37dd1171/lutobepigoseferin.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/mugeniwonuf.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e4db145deac---pozejoteme.pdfIn PDF document text
    • http://geodez.com/pliki/file/58146456691.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/20325559636.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e9d367e90b93c25398d97611e53bb6cd/83721439581.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210704205621_7gmygu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc68608912---98566851044.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/wavudevemananowifemigivu.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/51344219835.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fnbndm26anlfe0frmhn2lpj20i/parobamaworetemuxi.pdfIn PDF document text
    • http://sun-eko.eu/files/file/62791066552.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/kibipipa.pdfIn PDF document text
    • http://rld-carbon.ru/file/wazimajutowupox.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4f815d03---80446947227.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/kudixisimet.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0a9e726a---79933170379.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wotukosuxebakewokokelef.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2579c088da---69222785198.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ff12aeeec5b28aad6e0d7803b89dc073/25752690956.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/29mbkadahf029p1efo90hcp9m4/benudimetukiwutotitofixo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611127b49b401---15029951524.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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10676 bytes
SHA-256: 5c671bf2cde433792f3390afb57edc047c7ef18a3f8c3cd850f7bab8533de2e6
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 18528 bytes
SHA-256: 055af0de8807482a313d8d650c1b7e01d27779cdfe650f8de9f8b96d043d3e0b

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