Malicious PDF — malware analysis report

Static analysis result for SHA-256 af737bde7a663bc4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 20:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e3495b9f2229dd548baad3f47baf117 SHA-1: a3e6c010409752027f47986170563371d0d25b8e SHA-256: af737bde7a663bc47c0ec0196943eeb60aed54fa1654bc7425b56d17ccb924d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://champagne-marc-chauvet.com/images/files/36481649848.pdf In PDF document text
    • http://gianenricofabro.com/userfiles/files/defafi.pdfIn PDF document text
    • http://peoplefoster.com/pliki/tatonijipapegedakelupu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vebeguxa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139db62de26c---kufofebuze.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/60487663027.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/31391988913.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/91659480214.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/33625610269.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sabemamen.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/17659076771.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/2452289329.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f65b3bc049a0104b6c03b1e4b4880a86/88623952139.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbec54653---wijizusozupewuvorawagug.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bapokisowakenub.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/88047293399.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac04e01a7d---wesogovakivad.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/kimevidopibagokakagazubuf.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/bezofujukusudofe.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161399071317ab---xufasusorevug.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/didawaxivabedit.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bakifela.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/pigeke.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/37723459886.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210913_B4EF42F02978683C.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+games+ppsspp+downloadPDF 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_off0000dbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEA 10772 bytes
SHA-256: 4204f438e0624096fa1ea55db5a0cee88b721ff45d059dbe03de904994070341
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16928 bytes
SHA-256: fc7d253e9531ed19e9bbb41d447e2c151883c130726f44553a71879384cf7c9e