Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7a90fc639b5410…

MALICIOUS

PDF

106.1 KB Created: 2021-07-30 17:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e7d9fcbdd480a4b92b1817f20e82b177 SHA-1: e7b4312fca1858a6983e6336c83c3e5f2d8cc62a SHA-256: 7c7a90fc639b541026d0b08d3c11e839a6ad16fb1dfe632d697c8d1b2e82b4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous external links suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=when+is+game+of+thrones+season+8+on+dvd PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1lvf00oopsje3o3gnj84rj3gd9/potenolubiweporazirer.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59c1212b9---ludisas.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160982b8aa7f73---86206374551.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6515b44e1eb7d6cbaa26ccd3bb86b972/xadiretijoragujoje.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/62109f3570494bac4091dfdf8d68850b/putafosebifixepakigafifof.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/vonodikipuxapodudiri.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/bhbquek06ula0h4ln5h6sjb5bo/zuvuru.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16097203f1bedc---zuvukugasixuvezuwixawo.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/wafajafog.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/05d3fc1a0c64c442d75f25505d996092/14593886234.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c9c92750---8370368880.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875035d1583---rorukefonotokeboxefi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c833da8e3---rabesegufix.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59e4939dbf---44607614819.pdfIn PDF document text
    • http://dienmattroigiatot.com/uploads/files/mevogimowotaxabugufipumez.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73dfbc335b---57762583262.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5744d464a---85799195588.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fa6b320c---87202836621.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/99121998338.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9c300a7cb6428f38be88a7b136380b29/lawegubar.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a424912b6f1---46961531762.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/23341972323.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/60689684772.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kanoxezubi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A2 11024 bytes
SHA-256: dd946fd9fb025ef88e5ca1fb800af29da429adddf7dc4fbc9957df56dceb85b6
font_01_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B03 18128 bytes
SHA-256: 0cb2ca29f189b6feaacfb7a115c809d7279aa9a2d96f9e88ffebb61acfd88904

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