Malicious PDF — malware analysis report

Static analysis result for SHA-256 188ddad1e98f4bc5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 04:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a5b0f217783fd002eea8c11cad2b5c2 SHA-1: 873f8a4bdc612813a649fe40155c04e9acc118c3 SHA-256: 188ddad1e98f4bc5594708f59772477fd1da625ff2b625766a69321303a97e3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with a phishing lure designed to redirect users to malicious sites.

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://4998horo.gmmwireless.com/contents/files/90177959323.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/fafibajopiziwu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/89892714021.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/24614542924.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/8679806809.pdfIn PDF document text
    • http://sy-smile.com/upload/files/14960125575.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/80239980237.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/ramekemuzexariwupamijulet.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/tokixefoga.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/287625200.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/xazilapezafoziwaxekike.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lakimeresapewovinezuwinur.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/jowanerirewugafewe.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/leweremeworipe.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/jewigisolu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6b4febf69---90495514157.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/82205913438.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612498b617d1d---37397177714.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/4nblo3ndkgu99v0m4sknthbo0b/86335008955.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116903236ba8---56930027788.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lozenom.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/13393133492.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/0ef1ca971bb2314ffb99a7edc9866302/36823677604.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160732b49401e7---27591999845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=humanities+and+social+sciences+book+pdfPDF 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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 11004 bytes
SHA-256: 08a25ba32da6c59aa86c6942e804a484b8861986cad996a9aa767e75a8be9615
font_02_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 18368 bytes
SHA-256: 026368dfe586799d4a289123faedfb5d28bb5b50c71460a8da3277c5853b87be

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