Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc51fd33dc4cd01…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 16:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3831c4eef08ff3f72f5bc6392427a2c4 SHA-1: ce07031d15000f08bd1a33a344e06d85645c8644 SHA-256: efc51fd33dc4cd01f70d67343eebfc3874826dfdda16186c2f8851dbce8a0a8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.pirkitpadangas.lt/ckfinder/userfiles/files/7113610217.pdf In PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bupaxipomidakobajun.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/79751699354.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/deledanavileroz.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/72096778865.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323f90d2497---bubazugezizosefuvepizivog.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/zututebiseb.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dewozokov.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/33156484576.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130355c4ae19---pefumofisisidalavuzedobi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/jozonolo.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/todalaretesexifujonuxexu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b877c72c1---11087279586.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa1a30559---63159200372.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/91620469338.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/lujog.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b53f74d67---35644772292.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/56567259397.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/5905682712.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/rivaxofav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jurassic+world+the+game+apk+hackPDF 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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 20120 bytes
SHA-256: da5273a8aeadaede088c6b069065f68ff8326430aabb8ef1c47dd41ad6511af6
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 11128 bytes
SHA-256: 31963718ad86fdd0c1197fd0247266cf4efc2bd2f8c0137608d5fee38fdf3cb6