Malicious PDF — malware analysis report

Static analysis result for SHA-256 4309f2f34fc1e6dd…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 14:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be9c56b93b37c62f4ec15fd7b2da1d3f SHA-1: 4756905a9b47cff345e0df00e306d068d3d0072c SHA-256: 4309f2f34fc1e6dd544a0ea2e92289959ccd7884081d76b769f5a5e5ab5243a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document likely attempts to redirect users to malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://archism.ru/uplcv?utm_term=fisma+compliance+checklist+pdf PDF link annotation
    • http://escuelasfutbol8.com/docs/files/44630626421.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3badbdc02---9672161877.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/21573546912.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/dobekezufajodegiforolim.pdfIn PDF document text
    • http://chongros.com/userData/board/file/nusafan.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210605_CD5286048FBAA12B.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad0a1161ff---budufuzurugosenusazusu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/35011084643.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/d1nv3htb3glrlktq0vddfftc0s/85041994582.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/jusix.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/89650802214.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad82334515---dalaxonoruk.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f7262991---getuzaro.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee27b89f73---35406539116.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/h77m79gg8qb4v3o7338ko6pd00/gadojesebivetijopakudigi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1610cffcf09b1b---xakiwolemujorupixunaxof.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/xariwubaraw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/il16aidootlgdhvkea77ipeck1/97585073790.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/nidunikokavag.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/39956042041.pdfIn PDF document text
    • https://ewt.cz/res/file/93494025030.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jubixirupak.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/je0ocdoqqtf223c86dtaksjf52/77940017681.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/13299793970.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/joxidawazakir.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_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10856 bytes
SHA-256: e4f351d757cfbd727ab611a610b89964e73d349b67fa0ecbea4d5703f89583df
font_01_sfnt_off00012d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001451f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451F 18900 bytes
SHA-256: 5bde74f6c607659ff12fb47c0123022052d9a59a33d6bf7c4ea286d1d9b1605d

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