Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a036ea681a04566…

MALICIOUS

PDF

85.2 KB Created: 2021-08-10 06:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49c54a314e2a95b6bc6ce88ea54df99a SHA-1: fdf30df37bc7b9f8371c943930349b41bb9a4b20 SHA-256: 8a036ea681a0456693a35a2bc6bfb9284d3845046fc980f3d278164760596225
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable or compromised domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan distribution attempt. The presence of external URIs and link farms suggests an attempt to direct users to malicious content or exploit compromised infrastructure.

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 http://svatba-emi.com/uploads/pages/files/dokobidakoralipezi.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/m1lej95rhdg3u7a83vvsmf3jl8/jofinokokota.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-24/20210724115223224008.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/73811261103.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/jesikijataresasidud.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/569b4d927eb1a414d0c304f677c192b2/valusuxoxu.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/71301296150.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161047e353df6d---93866675416.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8c7b3795---dodutiluxowutijibojukike.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ca25824a---62757224171.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/vewafuropinorikusomaxob.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/posefunuvusawo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac039a2eab---wekiwapedoterizol.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/dujaxifegezinowexowove.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/09r7583pvd23e305orpi9uqktl/72326616120.pdfIn PDF document text
    • https://etadelloro.it/images/file/waxesumenewijinixozi.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/xadesusukurifuguwaxapod.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ca0a453e---24384545258.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/keselot.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/1636122657.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/9611614929.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/83227620647.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160996aaf8014d---nalox.pdfIn PDF document text
    • https://limsurdua.com/contents//files/23721244272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+fractions+quiz+pdfPDF link annotation
    • 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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16564 bytes
SHA-256: c1572f02031b54497f132909a41af9b7618942f633e820a21d49dcda1c6d2826
font_02_sfnt_off00012c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 11436 bytes
SHA-256: 5277fd8796237fabfded061be783fd4ed5e445b3a85389b1486954c9c085d061

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