Malicious PDF — malware analysis report

Static analysis result for SHA-256 85999486de37df29…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 03:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 751e95797b246c7b9ea54d102de3411e SHA-1: 6464b05fc7a0cf56aca4d866501719d1d748aaec SHA-256: 85999486de37df297c4e5333e95a7fb68880387f0079b14ab39848f59738d828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=hollywood+studios+orlando+map+2019+pdf PDF link annotation
    • https://butterfly-propertymanagement.com/userfiles/file/nifadisaxigatipu.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/22183728317.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/bofiwopatijudidufusosaxal.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/558337443.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/sebobimobefarategimujab.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zosatuwodojemagi.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/79523757402.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db04df2a8f7---xewutepapuvem.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/zujatalizazulanesijevore.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/18159847376.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/tixufixagape.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/306nh2gs6ak93fcd3cb50hh7t7/8969088118.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/9905193062.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626372044.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/toripizumive.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ftskm9j1d9g8a6572n5g3bjrh2/78026310727.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/98297706543.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20783039946.pdfIn PDF document text
    • http://olympusflights.com/files/files/kidijazomusoposisetot.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a758fbae435---vinibapovesozifuxipewapa.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/98951822180.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/lagarunewujes.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e203914417---ferojuvugimop.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710eadf2f18---24705725356.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/14468970998.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_off0000c1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D9 11280 bytes
SHA-256: 289a8c0dcb70d0a1a38e943c3a85b513a5ba45fb1be2baf65cd18f292ede2fb0
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 16980 bytes
SHA-256: 655d95c6888519006061c7ee0c6c94811eac94971e29c0396871bf47f0177978
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1