Malicious PDF — malware analysis report

Static analysis result for SHA-256 549c6f62b37b276e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 19:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9231fe5eac3de2280b586b49881c5e0 SHA-1: 3aa718d16e0e8004d76aad7d8db1e2a0134a1be5 SHA-256: 549c6f62b37b276ede4bae76ae0c98ac1b33d98bad936768fb354f53a8b25aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://fceresources.com/ckfinder/userfiles/files/21507108494.pdf In PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/14733783536.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5ad53125e---21259391921.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7chq63okdga0sg8ot2cbd42n4g/fegito.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/akubph9lroqip5471qbmhhseo2/wasijodifaxepatanuvab.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/fozuv.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/308qumrrf83adp5l5ej8miebms/zoziwonedifikupubi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/19208416320.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/e443d0a21e871694fcf84adc398da3dd/54699224650.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/45844639447.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/noporekodumimivawuj.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/6719038325.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/xukitanorubizetobaxo.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/mumesap.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b858a82a---zopuvimogebuxu.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/20018491846.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076411241027---13062062470.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210804050500_0xkuwe.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/ximabixapajowakidodipoke.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522074826_gzdtjo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tatoberapudilenix.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6c455857---32045768523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manager+roles+and+responsibilities+pdfPDF 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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 10804 bytes
SHA-256: eb04e534fe1e236afb45e7c280ab8e4b6d121c094b1525bc7d0bd76996cf5f92
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 18616 bytes
SHA-256: 996c3690364d19fd6dc740b86dd3aa6c8c4aad0daf13fa3e9353871aee689432
font_02_sfnt_off00011bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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