Malicious PDF — malware analysis report

Static analysis result for SHA-256 265dd62c4b634d2a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 18:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0d329ede41444e6bb6e885bb4c078a1b SHA-1: bbfab746cf8929c9607258bef4f13fa0b74bd792 SHA-256: 265dd62c4b634d2a7c98e43c57ec46badd10d32a9c6a00229876ea2cd4718776
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF files hosted on various domains, some appearing to be compromised WordPress uploads, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1715

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gikguamerica.com/userfiles/file/zolutoxij.pdf In PDF document text
    • http://whuntex.ru/userfiles/file/50201782427.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/52324247319.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/saniwopevokabinoxalu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f154ec9ccaa220ede80bac28aea1b1d/nebafitezodidaxor.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090801f654b7---24632721544.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/21403878943.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/ragaruxonigokovus.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5793228569---86583922658.pdfIn PDF document text
    • https://defaico.com/d/files/difebikamumuwujagivusawov.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/24900152468.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0e7b645c05d7576ef2303a14f8cead6c/26354666687.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/85365613363.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/vawerexuruti.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/19673998873.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db25bbe933f---49416309529.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a8d345c2ac7db3873d8b38a0401e6029/98740624067.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/15846509280.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16123c401d6c52---jumafoninuj.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/detadisuvuwofu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/2995795108.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/55722176256.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7aba7341---verekabeponuwoziwugi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61ff3901---78715435737.pdfIn PDF document text
    • https://dm288.com/slicice/file/pexaxoke.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/21426208832.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ia8ud8rr0igesftr6qkpqcql37/28277631385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=st5002+prefabricated+structures+notes+pdfPDF link annotation
    • 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_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 11260 bytes
SHA-256: b39100ed6f87c1469184a923529115e3a2b95f795aa07caab02e940422f3fcae
font_02_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 17992 bytes
SHA-256: 93a03d9a808ce334ce818693661c803e9318d954da93794d7960c2c41604f8fd