Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef398b03f88ebee1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-12 23:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb7d88f6204f12e825d41f5d8da2e23b SHA-1: 341c57db882e8528fdd74e486b9995b70e69b8c1 SHA-256: ef398b03f88ebee1a12364aafc49184a57363cd0ae09e498840a14768e362c8c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The heuristics strongly suggest a payment redirection lure and a password-protected archive handoff, common tactics for business email compromise and malware delivery. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://splogservice.ru/content/file/rosudogadez.pdf In PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/6766890835.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/pizetubufewajolivoretoxu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/24804052068.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/worikuwapaxugubure.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/60989258143.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/suleza.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/buputivejamisujawasidali.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/sipejo.pdfIn PDF document text
    • https://turbooto.vn/upload/files/43091663789.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/ropokupovuteb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63e817806---gomodebekufiwagimi.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/dogerupedujebume.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/89942640408.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/dovemopusipimodomerixedo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/tozipotalusasod.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tevomazosi.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lamozubo.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xitesaxafujejirezofan.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xupatirebam.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/678b7735e2f9f760567ec5f7cee247b1/tufudanebuwapujewisawu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ik378te3c93aee01rk6iq1os1/xotipojixukox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+free+generator+accountPDF 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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10392 bytes
SHA-256: 970680739d7e6c43c96a55b8999a30e362f4427cfdcb94d2e271f1db3b6c2bdf
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 20020 bytes
SHA-256: 45e0a17d003ba8a95897ec282a4ba949ba2d3c7eeac5344b8ccb063a0fb90b77

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