Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19c478c0553c49e…

MALICIOUS

PDF

92.9 KB Created: 2021-06-30 22:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73978b319621c8fee5aeec97731dc79c SHA-1: 25960e717b46a03031fb06a4d61fc4458e6a9b47 SHA-256: c19c478c0553c49e81c247f7d3f602ee186d36f19d77d9fda8fb9c0aeece8a2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://cructi.ru/uplcv?utm_term=how+to+find+rayquaza+in+pokemon+emerald
    • http://caratow.eu/userfiles/file/46375130167.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9cc6204300c0a8da9aa79a39ffec780c/kegememilo.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e3e622b78---19596352506.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/38e068f0f648addae15b97a20c00159b/nebemonejebumaboxakugule.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/li9gkondecu8lf5cfrpbq7gia7/fugisofutubujowozakiwaju.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3foir0ff26guqnipaggsgd8af5/53115223480.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6af3ae35---20695638461.pdf
    • https://cupanghitam.com/contents//files/33437684692.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/44329575b6f6f682a6bf565625bb8529/jotepalu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c16e5869---sibikifaxorakotubas.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/9562f048dc54360cf50a0d1fc3c341e1/80478736599.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f17ca8c7---20851589934.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/dokisogoxozoji.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/4ed3355823aebbe6fc03199954b750dd/12749111395.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ekbgnqm8oi8mu4b543446os4pj/26689904633.pdf
    • http://timeyear-v.com/userfiles/file/96738354547.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efa88e00b---50349379657.pdf
    • http://pogservice.ru/userfiles/file/leviveruxolon.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pd91na57b16j9vbv6fmcp8hv0e/88477967438.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ivr5ufe7ut1rcp23oea5msn6a0/tumedawewiwabobo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ade671d6b45---76823195743.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 16792 bytes
font_01_sfnt_off000111ed.bin
06f2b85205e38c58a66ecb202e2cb25f3effb7dd1c4d0fc80310c2f96a2bc095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18208 bytes
font_02_sfnt_off00014156.bin
8c3f733e982c0fdbf3b0497db6846c575c0ae7351be4aee74fcf30641073cefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 11080 bytes
font_03_sfnt_off00015aeb.bin
12112f3474dd9882e3c4a150fc7d48eeeab70c81308530623f12b3c795f4d12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEB 2404 bytes

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