Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa5d5da691f5fd3…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5ff44105c979cebe1dd3b5938849842 SHA-1: 1303ff58f6652ec4a01cef47c22e9900fa2082e5 SHA-256: 8aa5d5da691f5fd343dc9029ef220331c4f63ccccef19475826f2778c16d33c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=hack+for+onlyfans PDF link annotation
    • https://doctornhospital.com/banglanews24/editorsfiles/files/82208584023.pdfIn PDF document text
    • http://arablift.net/userfiles/file/97237996602.pdfIn PDF document text
    • http://52963566.com/upload/file/202109161210574149.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613638ae74bf2---dukowuv.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/baxexufijafojipesike.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/muxobu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/812803167.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d331f9e1d4b621cfbd628d7d2c5e8288/24948404107.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/tesujatekoxajezokaje.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/97359663181.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/fagunofibilosikifilu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/lusizidumiwikoxoguzufud.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89084bd28---49041114307.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/kawivibarinovum.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/46006672518.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lekusuzojaxuz.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/28209307891.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/bomikotebibik.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/44727575258.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/basoramudilu.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/rarosovidefifuti.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/50625515615.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/fodegabilo.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/65989209207.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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 18324 bytes
SHA-256: a34bd56952883b54e14ef13bf09d19cfed4087eb913b3872d6e6429eb31076af
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 10204 bytes
SHA-256: 162ae86e3dbe9f1aec211e0e329c4efe25b8b089d41868964568f47dd168d15e