Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d9b5007f93f4d9…

MALICIOUS

PDF

85.5 KB Created: 2021-08-31 09:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: edf188736aa76963847f01e9d7c0d592 SHA-1: 7156e461d55bef7d66386d4f34a7e4a877da31bd SHA-256: 53d9b5007f93f4d9c8d522b9732c55bc9a29ff2a1e139690a4be89fc26f173ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ndt-tl.ru/upload/file/fakizisul.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rvl0mge6m8s512mbt4uddp6jl6/mekigowejowevojemibefa.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/97693293520.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/6bd1d830159dcebbf4205e4a92325de7/65078281313.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/37127432171.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/e9g3ecc909t68tf78ufp5m1e05/58146942163.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/vovuxaletedoxivulilulomun.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/392c866ca4fe70a69e306532a8a17fce/19789603551.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/bowomegujifofinenilekobo.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf273dfec4---93890527694.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb9b4885a---fusomabekifu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/80c9102dcaa13ad3b6fe101173d2f399/jubamorevavufa.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/vinudifopawalupaxaz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/65527fe1babd7065454ce2a5be4de791/xuvuguxefezijeriv.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/25955190289.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/7413502495.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/zatejakof.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8b9693d7d525a16b9eceeb5ec85141c/42085094157.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d50930af---79652653676.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/betiferaxa.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/zafajonufoxos.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nodirijowazezozuzumu.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/xapowububi.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/80511332579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=medical+humanities+an+introduction+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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10976 bytes
SHA-256: 1991ae5a813e378b33616c1723fde257bf74720dbc326cc8bddc99bee214ef64
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 18164 bytes
SHA-256: e9790393b7e8f332e6d70e365ea25596b9b08ba75ade1fdfdf86c559aa26f8e2
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1