Malicious PDF — malware analysis report

Static analysis result for SHA-256 797da1d3d530ba3b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 20:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 247db717472c4f05096e2c94532e6d1a SHA-1: b7c605d8b556b1b4e5ad68c24018fe4ca8efcb31 SHA-256: 797da1d3d530ba3bd85ac89c3ff1528a10db221bf31700afe21b3886b10a2f04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://promocode.lu/userfiles/files/63717330259.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/dba2t2qq78cup3qse1vhhdfu15/20014090703.pdfIn PDF document text
    • http://school15-tyumen.ru/f/jugulago.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c97a142d---96867159130.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b6a9dc49a27---31445298465.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea4b55793---gigisuvekulutolu.pdfIn PDF document text
    • http://orem.mn/uploads/files/60251429526.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/31697515804.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/74142895208.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e70c5ac10a0128a8c56b4009b10f4605/65681199718.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/10369497469.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2bo82ud0urv25qdvaahh6u9n06/86308564503.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099a66a74f00---malumafilide.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b0dbc839---xewanijomugedusogeritimaz.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/witotemanavawisomusuno.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/jesepozovelizanuxokedib.pdfIn PDF document text
    • http://sbairs.com/datas/files/45003684972.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7f6e6aed---nabeboz.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/71500217527.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/jevoxibesi.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/silumafijotetagorugalisin.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/joroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=income+elasticity+of+demand+worksheet+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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16576 bytes
SHA-256: 3f66b20a61131809263d4295a6ddc1aed42634b4429a83f00179b6762d723653
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 11128 bytes
SHA-256: f5f6c22afd72a4fbd7ce2a36308107c19c2bf0b8e8419fcada9fa8b9f8faa973