Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e35f460464a9f8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 17:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c29993eb72d55c1703cf7dc60c35cba SHA-1: 5c15c563deb8017d8625df26e41e2f29c37c49aa SHA-256: f6e35f460464a9f83dd8a96b5e9c171191067cd3eb42f87d43aab9873a0a9bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=factory+reset+lost+phone PDF link annotation
    • http://konstruktor33.ru/app/webroot/files/files/zetafudak.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/74182486328.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/81991780126.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0604c381e921e6529e24786a50c866a5/82506100416.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/bavixarebod.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vupelakemelikanifig.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/47855695637.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/24210265297.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/kagetimoxa.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/jinosowojupu.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/70382215437.pdfIn PDF document text
    • http://4rrecycle.com/files/file/49433719894.pdfIn PDF document text
    • https://akemi.ro/hirek/file/siwuwomuz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnmc1h9nubhuav26lcuc22sc13/30328889573.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d5ec24c6e980509dd540b19c75721d54/xilobonibovetivinibapaw.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/bufopojef.pdfIn PDF document text
    • http://keramann.ru/uploads/files/27330635944.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/46764201884.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bbdcdd498---12313788574.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/46398731737.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binukemuk.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/59902912457.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vojesosofofolojew.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_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 17000 bytes
SHA-256: 7472567a6330e8b847b064d2335672b9da179ee4eab3f6e7c16c62769883abb2
font_01_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 10468 bytes
SHA-256: a912c54764c700f0ee364c2ebe90461ea49e87bc3d8ffb26a5e2a79d4492ae33