Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11e2caf9b1029a6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 15:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9768007dd1aebcdaf26225d56af523a4 SHA-1: 5db65c549cef5a0e13a0a83d1db2c3e2e20d1c9e SHA-256: e11e2caf9b1029a684b8b8bd0e83e9f6131e95d478cb7f2963f6375de72b33b5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=how+do+you+clear+cache+on+an+android+phone PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c67419142---volako.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/98402946414.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/27474738623.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/76607746417.pdfIn PDF document text
    • http://yoron.net/up/files/94646315094.pdfIn PDF document text
    • http://medi-sen.com/files/files/32460171363.pdfIn PDF document text
    • https://music-group-store.com/upload/files/koduwojunoreparu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/91601584881.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wizajojedagup.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a83fa74fd---49940895037.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/11881944270.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/43359638493.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xiwuzujegazazituzulala.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/7680768338.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/67600775267.pdfIn PDF document text
    • http://torgoborud.org/images/file/69699960027.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/16602082436.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369fc5e7590---20259468959.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4ed3043cfcca987a914db843883ec03f/24951952420.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fobumubafabejofa.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/zuporexofoti.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff7a21037---puxesonabinexine.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/nezafasotovuvus.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef857bc53---31160832372.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/23451626483.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/birodajumim.pdfIn PDF document text
    • 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 10636 bytes
SHA-256: b03967f3dca98818ee4b3f3eb5a1f1493f80311d7598d624a6c63feb5f8381da
font_01_sfnt_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 14424 bytes
SHA-256: fa4a2a1f4c42ff514323cb7f8f45a742d898d18e20a81b18ca41b500cde7228a
font_02_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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