Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ed9b48b9e77aa2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 09:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efe9efe1ba1af278ed33840364faf6d7 SHA-1: f4ca98a44b4a96195612a87aa7249e527a69f19d SHA-256: b1ed9b48b9e77aa2155cfafb8e2ec7dc3321081b96ab8567233a2defdfb58af7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many distinct hosts and disposable hosting being used. The embedded URLs, such as http://furniture83.com/upload/files/88289756338.pdf, likely lead to phishing or malware download sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://furniture83.com/upload/files/88289756338.pdf
    • http://fairfresh.net/assets/admin/ckeditorimage/files/25112506853.pdf
    • http://wsospice.org/uploads/userfiles/file/file/mubizog.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/ranekafudakodofebojisu.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/84903360468.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/nimiwapatepokevizalo.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/85976342148.pdf
    • http://tuzy.pl/Upload/file/15752636060.pdf
    • http://skrn.cz/pic/file/23576417793.pdf
    • https://kingcarmotorista.net/uploads/files/pezoson.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533e82f806---todafinejove.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be0280cd81---4190974589.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/lasibaduwoluxokeg.pdf
    • http://polipadel.com/userfiles/file/38732180106.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/c0031446f52ff8641f26c98d3b841408/majudufamifosigejo.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/begos.pdf
    • http://architettogherardi.eu/userfiles/files/xukupesobiwebe.pdf
    • https://suacuachuyennghiep.com/uploads/files/nidobo.pdf
    • https://csmgh.net/pevron/www/img/file/nivakezivuvawewifuko.pdf
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/tejabolaxesexubilese.pdf
    • http://drukarnia-warszawa.pl/pliki/file/39814249849.pdf
    • https://binarbaid.com/public_html/userfiles/file/29121712922.pdf
    • http://spartapr.com/images/upload/file/zokesokasagitoz.pdf
    • https://nstyapi.com/resimler/files/rulusazipavi.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/talejufufu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=playstation+2+emulator+on+android
    • 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_off0000b3e9.bin
55aea68caafcd5fae54cf0747c9318ebd460e95dafd1b9a59ba5eb4f93e060e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 15304 bytes
font_01_sfnt_off0000da97.bin
7c4211c60fee773e7342b78213793262c813dbd00097a1914c0142cba0aa5615
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 10744 bytes
font_02_sfnt_off0000f365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes