Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86b9cf5bec07d7a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-12 23:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7920ac484ec80937fdae9fb996e26dd SHA-1: 8f00a7e527a7c9654ad8ada53a6f1c04cd2392e6 SHA-256: c86b9cf5bec07d7a6baf2756f7354f6eaeb8befa5b631ef8585a9c5e18d07cf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://abe-rdc.com/userfiles/file/13575141508.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p705viduldcc5fahtoj6a2n9f6/17655917812.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b1353a82a02---jimojomarowe.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f1433641---zabiwe.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pijosebidufiguwejasux.pdf
    • http://allprintusa.com/admin/images/file/72852501432.pdf
    • http://accessprecision.com/userfiles/file/81980788570.pdf
    • https://aawyx.com/sites/default/imageuser/file/zomidebezuxoxasetizuxop.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed41ca12ab---87580827692.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6e8e4c1ad157760e50689c96f9656ebc/91933426043.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23e23c393---vezoribanigifudira.pdf
    • http://watthaistuttgart.de/userfiles/file/tideperepajade.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/541f5e791a73e240de8fe7567c10f434/49192825829.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/738a44cc2586f177a4de40461a5521c3/muputowikaz.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bbca8cf72---10810364544.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fa65d0ff---79758171789.pdf
    • https://t2sc.me/userfiles/petidu.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/56001a4476adc031bf8ecc4cc5794e1f/mewazinusonufimunumig.pdf
    • https://ksuskalology.com/images/file/94347655181.pdf
    • http://yaeram.com/userData/board/file/bisekuvonepemezovo.pdf
    • https://nibrasimansch.com/userfiles/files/83004231051.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea6dac533a---402229772.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/rivunigesubelivunulijoxif.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/73582e15beb95bfff169a58eb026c346/vuxaxesozalugaziv.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d11333542fabfaa077af6a95bd40bcd3/kozez.pdf
    • http://animationcoach.com/userfiles/file/49601751285.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hydrated+and+anhydrous+copper+sulphate
    • 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_off0000f137.bin
9878cc46023d43e9a2f4a2300645d4c1c7b4c90c31f6afc4bf279c27a5bf2449
pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 10724 bytes
font_01_sfnt_off000109c3.bin
d77cfead43a870484e6477aea338bbf1d90a6b62b787a6bb3dad228bf27cb665
pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 17504 bytes
font_02_sfnt_off000136f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16792 bytes