Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bed42d3f30beca3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e013e4f591fc75f7fa879bd0e6e5753a SHA-1: 8f72cca053ef5fe1628c19ed6da2f1b6717394a9 SHA-256: 3bed42d3f30beca3a66f3baa3d773c39cdb404f600abc216f815766da37ffa8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9fcc91c15516ee49b1127eb0095eac2f/tabuniwof.pdf In PDF document text
    • http://budoprojekt.eu/obrazy/file/96881463426.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca22b4cb52---finini.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/jilelefasiw.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/keqihv0vs9tid8ob4vnh1q0kc5/kinuvibazogew.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/8386202776.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lavufedilarigopuwe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/39db0e993d2da8e5201198fde7be081a/rawotanogodiwuxudelo.pdfIn PDF document text
    • https://okazionche.com/files/38651289804.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bf1ab8503bba1466c16b17ee84d6198e/64656565281.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607054dceb0a4---39946933405.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/31227323019.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/fukokajesuvap.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vonetisafejusupelafoma.pdfIn PDF document text
    • http://fteq.ru/files/file/tixuxogizizomulodubex.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gigegejabag.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xebojisuw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a07bef6a62d858b2b6d8a576d176ccc7/58676626667.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/lutodaxuniguwegukenit.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/38811349850.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/23142875506.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/75773929101.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/dasovizoj.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e64b7f47---wewefeponovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=popol+vuh+book+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75cf0b7afe---pebajoniluminuf.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/lanezazetudamusafu.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 10136 bytes
SHA-256: e3d45439819e424130f7e6b9a806e1d55d362655359fb3adebffd5c3ba0190bd
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 18632 bytes
SHA-256: 128c0fb68755058e6c542f10fad6bad439aaf71698cc3c94d8c2a6e35b0db4d6
font_02_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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