Malicious PDF — malware analysis report

Static analysis result for SHA-256 136e715bd6746dcd…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 00:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9089723720594b09814c1bae6bfa356 SHA-1: e8e3fbc501789a65d84300a8391d7a4342da9fa6 SHA-256: 136e715bd6746dcd492e28d247254157a26879e9258ac5da84a7154271386ee7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external links, including those pointing to compromised CMS upload storage and link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=around+the+world+in+60+seconds+book+pdf PDF link annotation
    • http://arredamenticucinesiciliane.it/userfiles/files/44871063331.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/vaxubiren.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/11991600459.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/timukijitewugedogafubazag.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee385f06e0---81696575866.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/renijiwivoruzor.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/28082132868.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/89006712581.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/70361596627.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/gabuwete.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/19080412242.pdfIn PDF document text
    • http://gnox.vn/upload/files/rinexuvurusutuwamexax.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/95593965334.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/85431370250.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/15357254535.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9b0a85cc0---zifivafisela.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/mazomijanekamuro.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/49591509854.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/4000576074.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cc491542ed407e4590b8fc46c2e01a9/59883497519.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/34616179191.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/juxeze.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/24b1553c243c8c03344ac32938146bc3/409170104.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/32196732010.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_off0000b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 15420 bytes
SHA-256: c5b897c06b7cb99e943c49527dc8bc1a5d8e508ac68c5b9ceac318580e9c1163
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 11244 bytes
SHA-256: 6b80ab4b1fc14c1cbc865c8c00e32485e6eb8fc3a9ee90416c09e75584c4d2ec
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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