Malicious PDF — malware analysis report

Static analysis result for SHA-256 4923d08a0f8e69c1…

MALICIOUS

PDF

94.1 KB Created: 2021-09-06 09:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d12559d6899c6164220be026ea783706 SHA-1: ac4b467777331f5ac5bd8b9d83b08d6bfacabe1a SHA-256: 4923d08a0f8e69c178e7e42296e811412ae96dae9e7af4faf60caf920785e083
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=download+novel+life+and+death+pdf PDF link annotation
    • http://shsuorui.com/uploadfiles/fckeditor/20210628/file/16249079934230.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ce9f9bf6f---41518637647.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/50571766645.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/63189017863.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e16c97913d4c7ea6319c52dafae57c6/mukivepipepozolevotos.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/sepalowirorikojavubujosev.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/99182081395.pdfIn PDF document text
    • http://flomojapan.com/upload/files/3353369791.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/55983163260f13c1356c38.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/visedunepefiravi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607544dc2dfff---fagewesalobitavodexis.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da66d6f5b---zugodudepufoxufumiduwenij.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b0d1d2a4---41190936460.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/juromozisibokaxut.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m2964tjfrclnvu5l4022dmhkpi/23475474405.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/sevivularogikakaravewog.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce757e4c39---48715910332.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/59442324930.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4e886b53---duvalubomuxatowen.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0f5f9c01d654a9a2d761272d69c9a480/95943071064.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210901110131_5pburj.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/74957663902.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/purisadekazojimageda.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/15087293817.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_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 19192 bytes
SHA-256: 12dbeba1472d30257c78870980ba0ac3811795726e07c06895e9255905f2f942
font_01_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 10480 bytes
SHA-256: cafbbc29b1ad1e0e9770e677770e4bf3cd133d3bc1459b7d6b140c9beafb7784

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