Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dfd2d547e9413a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 561c10e9365f6effe824f39d2325f740 SHA-1: 6300e8eb281da6cd49a3861f4a68424397709924 SHA-256: f6dfd2d547e9413a96e28250ba1504fbbe03de077a98b8d39e01279b613ae56f
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. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to potentially malicious destinations, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=bible+verse+about+fire+and+plague PDF link annotation
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/62079606576.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/18393279777.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c112f388f4e04cad12ddb10d440f638/77083011982.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/lf3qrkuhuoka55kkn9rccdm9pg/lisebatog.pdfIn PDF document text
    • https://nada70.org/userfiles/file/makezukojivisuwidus.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/refezeravidilajubinu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m255shn5o77o6ua5iff8gdh45/18103042345.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1f782abcc9bd2d79b4c1afa55723a484/53808769381.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/pawujupuxubewatowagaxo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/66ab0ae6f48c80746452883035fe8b2f/xawefaxaxot.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d1c4c00b---63129117613.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f5f31136d---30813951096.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/mabifa.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/nupajewove.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/sedojitaxixopodipasagowu.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/keremusufi.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/jaxok.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/pepubilemoba.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0uddhheredbuk9psigc9sfut5b/378171181.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/417abd90682cf2cefefdb5cb392ae5e2/ziwuxipitinuxikijes.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b56o28a1ejhfn383gl1fheeqv/milapekikuvonevexusezat.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/pakafikumivup.pdfIn PDF document text
    • https://kaimano.it/file/koludo.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/7435813604.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tuwexoru.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/sazezatafomazaribalirukob.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/35495185390.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_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 11032 bytes
SHA-256: 14bccc6b6b30a9145932aba872e7adabc7a634d5b7376a7dbdfb2188f4ea13a6
font_02_sfnt_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16780 bytes
SHA-256: ffb80ff4975d5614de75e91de80a08bb404ab58749d2d04abc692373aba45cd2

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