Malicious PDF — malware analysis report

Static analysis result for SHA-256 955f6f23d37d86d9…

MALICIOUS

PDF

85.9 KB Created: 2021-07-23 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43b19a4ac148662a2cb3afb028c6c44c SHA-1: 82f8cae6e563d2462ad2337e7f63d0029f303e57 SHA-256: 955f6f23d37d86d9075448700073bfa8013cf2dd3c506119c0c734b7a7749054
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the nature of the links suggests potential exploitation or redirection to further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://2-view.org/home/view/public_html/ckfinder/userfiles/files/28755111672.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/undvvns1f7gfrgv6cca8iu7nlq/72423588157.pdf
    • http://antifftech.com/uploadfile/file///2021070201500624.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ca9fdb95d0b422150854a315d86118ab/24733854241.pdf
    • http://prime-standard.com/piceditor/file/ributapopiwogimirumu.pdf
    • http://thestarbusan.net/FileData/ckfinder/files/20210722_7092E42E795EBD16.pdf
    • http://baigeleather.com/userfiles/file/kiwumepomolowoxizuzi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8082b10358---pidakowilagosikorumenev.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/13957887451.pdf
    • https://cmsschoolkg.org/userfiles/file/45947847103.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c597f1e2676e91b7dd7e76f448007799/26814660366.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3f7998904---14595595635.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbec42efe---mozedoxof.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ed9a42ee9d02aa4e4b9943ed54bdc3e0/zogixobadupop.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b002481b6d4c7cbf4dbc8a73ad728c51/gojidorajigojazerewarokog.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3837ae2e---13191781632.pdf
    • http://brilsports.ro/userfiles/file///88523520913.pdf
    • http://sake2metustin.com/uploads/files/fezebofevaf.pdf
    • http://solac.nl/app/webroot/files/userfiles/files/30521331094.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df814560a5095e79dfa1a76b1920725b/betevoguzojorakute.pdf
    • http://budka39.ru/files/22483519353.pdf
    • https://fonixkoncert.hu/upload/file/16320597205.pdf
    • https://metricgroup.it/uploads/file/xawelade.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=muscle+and+strength+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
font_01_sfnt_off00010568.bin
77231f199910b880e4236aedc98660441dc994a743fcc38be1e2fa8d8daa5f6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 10780 bytes
font_02_sfnt_off00011dfb.bin
948ac46501bcf05b295379afe43cef329012149cdbf4495f03fbe9b6000bffff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16908 bytes