Malicious PDF — malware analysis report

Static analysis result for SHA-256 247a964ea138dcbb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 16:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd8656c4d69ef959eafce47728ab82c3 SHA-1: 7a0ec8564a96bd1e536958efd1266254533310c7 SHA-256: 247a964ea138dcbb7a088b211c9a8eca5dd802956f7e4147f2f8032025b71477
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of an embedded JavaScript stream further indicates potential for malicious activity, likely to facilitate redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=export+music+from+itunes+to+android+phone PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140390711cb3---98045373942.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xolunajowisepuketololose.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fobitosebuxojuzuwojes.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d5c09df6d63442533c4c15095e6fa01/442076543.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25027381345.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/95835722564.pdfIn PDF document text
    • https://tuinvandecruys.be/file/10519448492.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/75071317274.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/nakor.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gazufodesuxilagaderoni.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b992baf4c---wusupodunizunanozoxida.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/72657689360.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/nolagaxubugedurezu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507223e2b1---52109129156.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39565586962.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc4778359---55549967398.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91347819381.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/sowubirusexobigi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613552eba8647---16327208171.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/dc35bf164fa7c9c207ddd9e2a88e215a/252511858.pdfIn PDF document text
    • http://allier-genealogie.org/File:/wadawurawojug.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 11024 bytes
SHA-256: 1984e69e896f55fcecdbe12cb14f7810aebe038d5f11b99042b90293bb94db15
font_01_sfnt_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17832 bytes
SHA-256: c52125edf1746b11f4d79d6e30ed3658364ca548ed74b5d9e7bc0f5f1c9d5dc8
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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