Malicious PDF — malware analysis report

Static analysis result for SHA-256 259f7316da0044d4…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f0fbae623df2a99c33b5a8a8f74a6d0 SHA-1: c89b1d5e927c5907aef6837516c05ba0efbd27e7 SHA-256: 259f7316da0044d4ce206452a12ad74f1af6387a8ab75ff49201c31b86a74d20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser, likely to facilitate further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://verner.lt/images/files/juputafesidugivixenu.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/zarorinidopimuge.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/29153870868.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jibolarapa.pdfIn PDF document text
    • https://peterdegendt.be/file/83688905123.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b008f5baf22---34130078494.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zusodubirexu.pdfIn PDF document text
    • http://emmaushuis.org/pages/pilumuzo.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/xupudomejazabijobolidunaw.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j4pe4rplnbhu9k66lo43tl89uf/427957402.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/13332554884.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/vapimajulaw.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/812890255a694e5094daf84c4b82e28b/boxomux.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/boxenoserezede.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/pibefa.pdfIn PDF document text
    • https://bursac.net/userfiles/file/notedevijuroxolet.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles//file/33705331423.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/51788422228.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a469a4235af---bukulorokatamifogetowa.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/16703947596.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92129266350.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nltpmbo7n9a7tnj6foidh3ttl0/13668988492.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/67622582006.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lodokowipefixonixipusixij.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf506bdcbf---15674929314.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3e2b1bd9a6a3bfd1ecaaa0d6ed1ed713/wemijofowelepibabije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=class+12+computer+science+python+pdfPDF 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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 21424 bytes
SHA-256: 12515dbedead8a46a484c08ed4335bfba819b6a1aa1530ec098d1540f15329ff
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 11304 bytes
SHA-256: 89bf15a2a9b5f6d5b00aea7c0a8b01f5732410d712e7e94e72fee685031023cd
font_02_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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