Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb038b027724cc8…

MALICIOUS

PDF

104.5 KB Created: 2021-07-14 04:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1e19afe43fee1f1f6c6e1d3042c24c4c SHA-1: d49da44320ebbf67f84083450be4a5b06ee383e1 SHA-256: bcb038b027724cc861f48d8b3fb17881c91f5cccd8d3a7fa3bb9a7d0c604f983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the embedded URLs and heuristic firings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://pixomot.ru/uplcv?utm_term=truth+and+beauty+aesthetics+and+motivations+in+science+pdf PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1cf555348---wabola.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/93602410892.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zozebigezufapojus.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c992c03b0---81922260608.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a904f4231cb---zezodatubazigajexisusabox.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/78007002020.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/livopakobinazukiwusike.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13bca2b9fd06e3e254d611dc7fbcd0b0/pematiposumatajulaxanox.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/nofugavelorufenigonax.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0cb2ef07---vifodarusujikafubudomava.pdfIn PDF document text
    • http://leesfeest.nl/leesfeest/sites/default/files/file/wugabarakijepaju.pdfIn PDF document text
    • http://effektfilm.de/files/file/30793643696.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8f9176faf1a0918e4568be0a2b530a3a/93302931773.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/04b8c7c1eb3755127997ce94cff3fed8/75980724508.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qndi85rpiovu6ofcgm4gqi9sua/41578848890.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0357168a2a---83050583195.pdfIn PDF document text
    • http://renovator.cz/files/file/roveviwasikimofoxopijoki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/644fd9171de94b1f4c4a308a9d8d25fc/86106912995.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/7b7f8848ffa50bfd593596e01d97380a/85226285587.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a8007640---busoweziwu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/15074580800.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2882a16695---18456904059.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/78732284214.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3d671d0e---renamojubibemabiw.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_off0001311e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311E 18168 bytes
SHA-256: 064b1438be66c86958ed91b1ab8fcb9c14e12a27fed20ef92fb0f6ea72464185
font_01_sfnt_off00016011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17828 11220 bytes
SHA-256: ef0f00d3f8a2d67eec4d0653436f7778bf66b699792c51282059ae2e7d1cbe74

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