Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cd8b8d867c6d52…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 09:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a95accd03dc7236089997e8abd6cf9ec SHA-1: 6dce9f032cdea1b38d5a4e09d356315d0480f7e9 SHA-256: 24cd8b8d867c6d5222803101e89227bc5355e7582119b7a14b4dcbea3bb7f75b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a deceptive document structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://wastran.ru/uplcv?utm_term=computer+aided+design+of+microwave+circuits+gupta+pdf PDF link annotation
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/926d5c2f343febf634017441a9409a48/31047924530.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/puwavemilawolifof.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/27035128366.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d093bot5ve8rmqb6ekhpb62rtf/petuz.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/95036801326.pdfIn PDF document text
    • https://service-panev.com/userfiles/22710394037.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff75dac62---85914525043.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/26071105656.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/vixunejefolejekirome.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/mavexurosunameduzesepivi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18e958431---liresefaj.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607192d8bae08---fumux.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a9904bc7---zotuxefojopevugiruje.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s02bhcfunctb0866lnro12epda/34863359358.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5c07299e---26209875374.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/jeguliwuzakokefuluxali.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/becd8b61a972674cb275ca4157d9a1f0/kedefakat.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/dfc70f19402e01a79d74293ab13c2afd/rekifuberu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/fatemazimazexibararav.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/u32qjbafgde29i45chs6jpklg7/jajuxozusebixix.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r9gqeeasbrd6iiavdt7hnefrjr/vewemebimi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1c28c348ae850e9c54a7aed64ff01a4e/26814007253.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/84883068057.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 11200 bytes
SHA-256: ac3a72d80ccd7a3b9b3d415007ced312744ea1fbf4bf46d5d7fb7e178d4b04f7
font_02_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
font_03_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16828 bytes
SHA-256: e3ebc9f283338c7ca32bd9a56ff3b7262898f1352cc0459c33ae09f03d6a855b

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