Malicious PDF — malware analysis report

Static analysis result for SHA-256 5060e7fa229b2b71…

MALICIOUS

PDF

82.0 KB Created: 2021-10-06 10:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16428513062d88b0ef13639c0c6f44d9 SHA-1: 03fc2e778a46768f1cdc5717b62ab0c23245f57f SHA-256: 5060e7fa229b2b71bbfb243dfa9e3ba7c83c27b0bb806bbfdd646289372f8373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://miyozenemeryville.com/uploads/files/80703114346.pdf In PDF document text
    • https://12shio3.com/contents/files/39076010041.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615734a731ade---7077350114.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb47b1c88c---mujis.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/811c4956260b376245d46a5aa72b054b/nojol.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1abf12a11c8029da06ac5277c7d71842/galakebufogum.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-10/20210910040447945086.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af26c8b48---bovajoxafananitez.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0541a3c3a---93153010260.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910235735473831.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/rulirita.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/bagisuvigoresunefi.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/zovetalabarorokas.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/vexesusagasof.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210919005216.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/79620439412.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/24539238872.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/12c9254d2fa9614a304c62e06bdca67a/xemutiniredevasifimom.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b98c8c1032---98305655780.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/29433026439.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/24764144683.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/81778528763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=a+poison+treePDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 10016 bytes
SHA-256: 7daa796184afe76fa61e3f57b5262502218ebee19f6c3bb9bae129e6286c1b8f
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 18800 bytes
SHA-256: def608215bbbf45a7649e22b70c1ca1427b04d615b5bf2121da7960d67361989
font_02_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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