Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a42fa09abcab31…

MALICIOUS

PDF

108.1 KB Created: 2021-07-14 07:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b65049a5d99acd3ea16ef02c60c10b5 SHA-1: 264904463d209bfbfdf6f7f11f3ddca31fb4c8a4 SHA-256: 94a42fa09abcab31c1421fdc7c2c67fc910c196aef7d74647cf6cf2b53408cf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/kujetolaboxibovipujonu.pdf In PDF document text
    • https://caribemed.com/userfiles/file/57853929515.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/wuzobunukifujeg.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a289ecbcdd4beebe94541c5e878dd181/garozabat.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d9be846e0---tavekodimas.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0af6b4d76b345c0aa32881fe6c60e51b/mozobanodigidativid.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f862c44f0---gavefiwolosakazamosara.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081103d18d57---92312396622.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790e160bf2a---98592567147.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79fe19d5f---vuvuxulagimiwoxarazamijag.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c27e1c70b19ee66818a9483e006d9188/85774268131.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/72412059087.pdfIn PDF document text
    • https://digireg.cz/upload/53079082471.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/064f4f25bd292cce7bc45699ce2ba2f3/koxubigibozojujujupobupa.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c2b337fd1eb514c11cda881683748b30/kexojuvekoxotekagug.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8rvo8gl25t79faa9lkig7bu874/81587779837.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/58169b6d2e8095270586dbe27e531c57/geken.pdfIn PDF document text
    • https://besteva.com/upload/files/67620665745.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/9821817871.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4010aa4b3---39986693082.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/bijoxe.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/75719898627.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03dbc467eb---50461434553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+transition+theoryPDF 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_off00013f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 10264 bytes
SHA-256: 3cf2c0e89b91bf75ef06437d615fc2427a436b1e2800e931d567352cbfb6e87e
font_01_sfnt_off00015682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15682 19628 bytes
SHA-256: af6c104f9e28e620574fd213e96f165a155996da596514d20d6a3a0b2348c986
font_02_sfnt_off00018b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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