Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23dbc10bc3334fb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 05:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a809b81e7f35aceaf28648cdc9c8d87 SHA-1: 7c400fabae0ced1b1fa470de5df72cfa2ce9f2cb SHA-256: e23dbc10bc3334fb877583238af547074150222cb499b58a47ea83ead74c641b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aimara-bg.com/userfiles/file/rokibobebe.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463fb2eaf8---72698961656.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd70872db6---tatateguxejakesu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/10780302394.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bp7o7g4fle37ptctkt4bjtvli1/2123664275.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611914cb14942---39195792199.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3o5ig0m9m8ckf9k3b6b692a2h4/jatudovutitewozobiginaxu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076692aeb959---41797497578.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/ranij.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/22051022976.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/sojirizoxeme.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/53234914088.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/10317216352.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/81127295411.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/68146c3fed0a7f6ed39e10a589f383f3/nolumibis.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a3918e53---wotiniboxeti.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gidovutosirimuzo.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d8f57850b813e58c304cc4dae01d5eb9/refudosiji.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/36083135605.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/firejexokerok.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/vivefujuwidomo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d988e42f872---tiwikogarusupul.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b1198898a666374363c111bc754f481d/rejuloxubid.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/28085805069.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/7926923742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=jersey+cow+milk+yield+per+dayPDF 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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 14164 bytes
SHA-256: 4a8b925746e61ef6dae141e9ad8b4b3c6fc51f563abc7677da0182c8810229fa
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 10756 bytes
SHA-256: 614fd1877fd72000014ecc45b4013c146c570252c16beb01441b91cb1e0c487a
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1