Malicious PDF — malware analysis report

Static analysis result for SHA-256 632d68bb4bf626b1…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 06:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0efa3603059f170fb70bfc497b5df15e SHA-1: 27f5385dff16712befc766b22d476330a56671cd SHA-256: 632d68bb4bf626b18c9de7ab3e5d20a7b2da0c941d14f7a2741b657c7b60002c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be facilitating phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://hutechsolar.com/upload/user_upload/files/zurivobikamorelaw.pdf In PDF document text
    • https://energooptima.hu/upload/File/tulewan.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/78164764885.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3a4855dc07a4b86efa2671959b1654f4/foraxazoxudevenimuvuti.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/41583105954.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607867c8e1e2f---jugaloxigegurazudeg.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/78228279776.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/10144573400.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1e8de386---wugosamat.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4be85dcf562544459055a211276a8daf/3229871178.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc55d272f---99712894976.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/44904716829.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/kilabidani.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/81457785267.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d614294b1e---gazegugunanux.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fudefamevadipaniwefafufa.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/zawutamede.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/56349364757.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupovazadu.pdfIn PDF document text
    • http://isvpro.com/custom/files/2158043267.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a4eba8d8---46556578799.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/5235063071.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/21778033390.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7118601067.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/gejosujabep.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93339dca---wugovutogoposofogunad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=direct+injection+mass+spectrometryPDF 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 16744 bytes
SHA-256: 2c9a17c4b4ba3ea819872964ccf6444a3ebd7572602c12f808c71fc99da34d9c
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10736 bytes
SHA-256: 1814b6fa9509d6635192e8a1b4a5cb11c138355c458d9ef5553ed89acd0f4e37
font_02_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1