Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f99082680fa6920…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 03:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a022e3ae89e9782c7e041fdf795003 SHA-1: 18c4351998deb5313fc3702490720ef9c3f0b0f4 SHA-256: 8f99082680fa69204d8b1a620a01b6c935f5f0954855a7f295493089a4179f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, specifically targeting the 'super-forms' plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h9rlij5rs1iiv3lssfnn3lqdcc/binezoragubitif.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8g99frie8vds7j0junr6fp8g0g/puretojixebebararubiwalu.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/d02474bbf53fcba2c2b899083b2961f3/repibaxugekukukagi.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bcnnhotgsduv7jcrsm87f564bs/vugofinisavukisuron.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160afa24e1755b---refuwakobinibojat.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/bidav.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aea47e3d735---79169123935.pdf
    • http://curry-box-deluxe.de/userfiles/file/63879077922.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/38a3888c7c26949621c434b7f4f7b173/kaxenerozefeluniwu.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867d9996f34---zubozoneduzomupuxi.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/16b09b530c32620d7cb230dde180dfa0/79625286818.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d454f693---gifizukavivimezafenuv.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e18bf0f63be0ae3f8549685c691c1b6e/wumosuw.pdf
    • https://adepotcustom.com/UploadFiles/file/20210510051225176.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3189a64e9---46479110966.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/81b42e6e13bf0dae976c0579c55cbe02/68390392800.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/95238497438.pdf
    • https://aldurra.ly/images-editeur/img/file/51666108156.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/25004914206.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/wuzozopur.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/3bded631da513e5a8727b55b272e2b7b/88790698473.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2e058845---ruroxalojasa.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4ac824820b9465d8ff753606d253bb8b/muxazovovo.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c19b274b4---soliruf.pdf
    • http://agnieszkapawlik.com/userfiles/file/wapojalopiw.pdf
    • http://bdn10.cz/files/file/luniken.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=far+cry+5+zombies
    • 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_off0000e3dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16792 bytes
font_01_sfnt_off0000fbf4.bin
09b1f96debf93ee0116122776ea4ddea570aceaf8fe3ea68055920bb9f8f3a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10568 bytes
font_02_sfnt_off00011435.bin
cd2574480b965c8cf0ed70d1b74cce18e0055e56f99e2a1f283a2f49612ef743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 30000 bytes

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