Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b710685cff4a809…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 10:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0073216d7feb8d2b65aaed90cfb3539c SHA-1: 905bead937b30ccd4f31cfe53f16e4dac32617b6 SHA-256: 3b710685cff4a8095f66cbd571bf294b1f65fa6febd843d38f9a90b903badc05
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised websites or disposable hosting, indicating a malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing malicious software disguised as a browser update or extension. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://puntolinea.org/userfiles/files/waganatumorazezikunasadu.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/707e6ffe66eacdc3fa32c8a91ad02c4f/19259355516.pdfIn PDF document text
    • http://abnicum.ru/files/file/werirepakuwizali.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/093ec0913a0b1574954357e55b8339c4/57979123776.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/pegozifup.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109121249273604.pdfIn PDF document text
    • http://timebymtm.com/upload/files/88892274787.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/weteru.pdfIn PDF document text
    • http://newmob.it/userfiles/files/88764643388.pdfIn PDF document text
    • https://edex.co/userfiles/files/44340716226.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/3732512213.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/86663747719.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/napafelavepidigu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613025b074c2c---93781350994.pdfIn PDF document text
    • http://pk.mo/userfiles/file/menufijogogitudujukabitak.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/68277912718.pdfIn PDF document text
    • http://punaide.com/userfiles/files/winovaxozaxovedodolobiget.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0ac1bba0---tobedasurasuvedipu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9lbn13e3l8ouesmellakp0s87v/xuluxexivibarowerivudus.pdfIn PDF document text
    • https://sainaudit.mn/File/nafokin.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/91866531384.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/16171991238.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/gavevikesagisomotusujif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+we+download+android+apps+in+laptopPDF 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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC9 10500 bytes
SHA-256: 2d3a078d0bb92eb780c7c1f85b7e69dc4cab4739d6f2d517e769d205e164a4d9
font_02_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 18028 bytes
SHA-256: eb59df860e0fb2f8ec209b38bd3665eed0b2c1121f9187621887a45b21a4987b

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