Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d74bc869d32677b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 07:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5142747f53434603bb89c37632eb965 SHA-1: e3321689439975c3c52711b0de8466478188f135 SHA-256: 3d74bc869d32677b70f29d281b0138d014cafa60cb24100bd577fba396d07482
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=livenettv+app+for+pc PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147da8870e2d---pasoberujamaferixibi.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rageneraluxixetiwek.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6dd39375---45512488419.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/gemovojixedojewoxexe.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/82632917042.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/13519406489.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fe0eaa075040865b32d14d2172d919d0/43541823366.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wokuxajupade.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/90225802819.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/75988910756.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/558dbf566cf200ff1ab00e663231b77c/11211834544.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/3521105276.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/76447997334.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/kazetigawurunal.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/popiridofolokug.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/fadusifivojunazevi.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/jifikekisedix.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/kolaruvexi.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/37259080636.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210906_135246.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gapusifasumazokudoworik.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/56296965152.pdfIn PDF document text
    • 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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 15356 bytes
SHA-256: a41282fb9cfacf2f6359e471965e43e94de0afd93755e167a2beb35c78a9295e
font_02_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 10284 bytes
SHA-256: e6550d4c867c424316216c47f4fd72e7ed37cc6c0375ba08af468bcb4ec656f9