Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d86d5c78328b1c…

MALICIOUS

PDF

91.8 KB Created: 2021-08-31 20:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67700981328b4ceb86f0daf5d432cc61 SHA-1: 4ab467923c2f952d1b37a9d86b2ca90f73598132 SHA-256: 41d86d5c78328b1c22296e366525174045ab651c4878cb03e9c68d37c6e5fa21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document's structure as a link farm suggests it's designed to lure users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/am69vkrgvqihsb1lk860tbmn2v/78846119806.pdf In PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210808_0BA8F8E69301130A.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/91958300923.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/dufaxubivokav.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078aad5b4087---rafavede.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/disodoji.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44f8e9d93---520381545.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92c794910---wurexufunanexuvat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qpjgv9ju553qpjna3pq3asmag1/25826461843.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/sudugazimuwopafije.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/833fac6e163a1e1f990a7fb522e44693/96123156861.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062609030876.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/vofifuto.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/nomatiwemuresexu.pdfIn PDF document text
    • http://crm333.com/documentos/file/moletixekawelukexo.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/59261638783.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ef71dfc81---51193101593.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/16367718987.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5decb53481---jafepujikegar.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/pogivoxosiwifeb.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/14944292234.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c94508118---sajefukurowajufewuzobep.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/43924475633.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210804031558.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/14143519887.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fezikaxolijaxamokuvaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+draw+a+train+easyPDF 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_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 17680 bytes
SHA-256: 34865f78feb3abcd20db5e4ad9596665110f2b048bc1386858efc5b4e318a5b0
font_01_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 10388 bytes
SHA-256: 66f96fa21eaf6747c86b6bfb2f3901f4075c2b4a7ff2473748888c5f0cdf38a4

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