Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbb25f71a07f6cc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 23:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fe0685cda13bd03a5abc394e7951f1b SHA-1: f421a1680e4bd53bcf83b86e152692526facd1a4 SHA-256: 5bbb25f71a07f6ccf18883c78ee08f45e21bb150ae9f3b209e322b4dc670a104
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://fructusartis.com/i/File/nolepigujetamored.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/704fd9b75551d9a62c7a7a86e2407587/42654390882.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/6545629480.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83a24573c---86995781947.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jamelowizilizurizo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ffe3d0ec---nogojemuvotulogejenaloxu.pdfIn PDF document text
    • https://foulardfotografando.it/file/jatiwolu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6651e07221---jilusodegajunadix.pdfIn PDF document text
    • https://susta.vn/userfiles/file/dalasamojot.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/29327926300.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10489aee79---kujavematufado.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a317ca860dc93b2ff16eb2e00d8b544c/92679154909.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/32084578660.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/jozak.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/81813576087.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160f559026f2de---98142174155.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/4999808100.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2b3aec5c5c97606ef28f27d89c1924e7/35126669716.pdfIn PDF document text
    • http://twilaw.com/files/files/wubobopotel.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/kvd8h8ja797jdoini91ao92ima/tikewisujajekolezot.pdfIn PDF document text
    • http://ahchala.com/img/file/jegozupoxoxis.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/87012321211.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/12373106513.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/50d9f5f33c493bc9ae568b289f68ac30/gugugil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=eaton+electrical+panel+schedule+template+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_off0000f3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 17908 bytes
SHA-256: e50a6783cb2fbf237b3191cc6a7ce22c83f8f58c1a64f4949fb3679df45246fd
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 10968 bytes
SHA-256: 0039600343783c17630c531f3b6c0c1c92cf396d9949f2d4833b9fc4b7d391ed