Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff810b2ddd07ca47…

MALICIOUS

PDF

94.3 KB Created: 2021-09-14 04:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 120c2eba6569a4568cc56b2c0e532a9d SHA-1: 6dee026507857467d24689607ebcd3bbe8525ef3 SHA-256: ff810b2ddd07ca47a62f7fe6fcd2a379abbcdf279cb157fa422a055501d9f241
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dreesmann-foto.de/userfiles/file/41767963843.pdf In PDF document text
    • https://luathoanghuy.com/uploads/files/gizonu.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/78626171621.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/67091530676.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121231226389.pdfIn PDF document text
    • http://horvathortho.hu/tmp/vufonakuxubazizivovad.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sqffpo2mk2mdl69ohmivi8tgr0/5252235212.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gufajotolujapot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2073079ee---59284632090.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/15789138225.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/44064486066.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/dupeviwut.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fujazovetamutizukedul.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/budenedefesudabozorenu.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/73450476893.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/23219934386.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e34a804c---29950158600.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/2554206334.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/84270024557.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/45981122972.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/45886628666.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/vebawukuguwuduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dynamic+range+ultrasoundPDF link annotation
    • 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_off00010b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B91 10928 bytes
SHA-256: 3ed3dc3410cdef76b37d07b1eadc4397eb937d360abea2a715b4cfe39b7f7ad2
font_01_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 18188 bytes
SHA-256: 044bc2269e758fe973fed72a20c5dd9d6c441ae68b2619c2d6d7a1d21ba34b1a
font_02_sfnt_off000153cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.