Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec465e10207aa23b…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 12:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 583178b9a125157c3920862c9262ec75 SHA-1: 83d8309a9cc155ae8e71f8eafaaf5cf550ee3824 SHA-256: ec465e10207aa23b1455a37687983cf00abc0d5bc0f88ce5636bda47f8d8aae0
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 websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links further supports this, suggesting an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://patrick-vallot.com/upload/files/niterotofoxapuwaripi.pdf In PDF document text
    • http://horizonpestservices.com/userfile/29669198891.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/69057845615.pdfIn PDF document text
    • http://wych123.com/upload/files/bizejow.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/83847839183.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613478da894d0---zixanidatotekisubum.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/besuladoxarofilalefus.pdfIn PDF document text
    • https://red-adlay.com/upload/files/87425242002.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kimexazetidajuwa.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130674656c4b---47809612661.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/liralito.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5246c5a3---guxafa.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/87484000753.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/34587296592.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/7336400996.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/69773409579.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xivowiwumafudo.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/83463709975.pdfIn PDF document text
    • http://seto.cz/uploads/tiwarekepane.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/46480774529.pdfIn PDF document text
    • http://foxadv.net/file/24824404883.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/wiputazoniwanaf.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/xisitosalazujopor.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/toporipixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clean+master+for+firestick+filelinkedPDF 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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 10760 bytes
SHA-256: 980a93e0874fc965592d2bca35128c67a66e320d8279dcba6164c54564984524
font_01_sfnt_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 16988 bytes
SHA-256: 27b083efcf80e28f8b43d005a562cbdc51766aa936f5b5dac9e3978649d166e6