Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e7b77f4baeefae…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dca87f8b6558519865aa3ca54eff9ada SHA-1: dc74b8f4ff28048fa677cc2d3e986cac2af707c4 SHA-256: 05e7b77f4baeefae14766c8c1962237925a0043a02eb06024da358a83bb2ad5d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier strongly flagged this PDF as malicious, and the heuristic findings suggest it's part of a link farm strategy. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=naruto+fighting+game+android PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fc6ac773---jeretijoxuxuwida.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075dceb03f0a---72056681311.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/bomapetu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052220514090.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/supelodik.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d49960fd2e2a60f6d393ddd1fe2b6331/mirop.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/dopesexeta.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/k6dviubj7sg0r6g21llr3jf4gv/98409407633.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711f829c6f3---21114500417.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/46054491324.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nh1q2hnc7g1moadk8gto0kcskb/gomoxanaresokulowatime.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a457da90---30677925505.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b824072---sesitulol.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799e813f87---zulotuxon.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e8ndebva3iimngmo5lt1ao3k35/80015585021.pdfIn PDF document text
    • https://p87.hu/files/88046592040.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/riteda.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/22415877224.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s1r27gejg78a3vf8co0ajcf88/27786952438.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607348d433e82---72902954839.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd10f72dad---45237117987.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q9rebhm11bkqk75dqpch0op3j0/63687016287.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/23460330903.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/90739336031.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16235619169757.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d900e764---miwabaxenifefikom.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_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16548 bytes
SHA-256: 8a00e904f93e92cb866197a37031c141b31df64f74748b64d50742d628458230
font_01_sfnt_off00011f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 10664 bytes
SHA-256: e9a8fe7cd8ce6e64bdb93882e6c71aefd8bc8538fb1e0d0b180e047ac86ef9a7

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