Malicious PDF — malware analysis report

Static analysis result for SHA-256 744486bfa085d3d0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 19:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99f851656fe5253c46e679cee5298f5b SHA-1: 058f581cd0bc3b4f87a18c7a3a975fa100bf32d9 SHA-256: 744486bfa085d3d0dd063fdfe3838d8ddf0dff5b22e0635133e42f81e01346a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://drafthe.ru/uplcv?utm_term=difference+between+can+may+and+might PDF link annotation
    • https://agatanorek.com/files/file/duxilegelafujujaluzu.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/fbfc69940ae672b41df35cfd91f5adc6/95903565691.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/fipawixomitegig.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5quhdia3b1d7hsejttrl2dukrh/laluloropepunufavulano.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/27e9c799cc6178af5501289086239e89/xiviwuti.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ccf79955---duwijonunasidewakime.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa912820d4---814974794.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8d12e34dab36f4f5e65879162c1612a/sejokol.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890c1668c54---87889115596.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/t6iltb6uemuhuqqii002vpecn8/25386840941.pdfIn PDF document text
    • https://campermagazine.tv/public/file/94187952775.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d209a9630e8e016867902d62548d6c2e/46003307485.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/vinotuzojevotegu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kofabofakeru.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4aceccbad---segofowiliwo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/wulevemu.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/66650180947.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ad458c56d8ffc1f823644b03ffedf443/latisewiwufinuf.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd95d7198e---xavajegajoxujuwamod.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/2da667f95eaca456bbccb3225be5047c/76122122020.pdfIn PDF document text
    • http://iphysiology.ru/upload/9466888911.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/28507722601.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55d1e80aa---xoviwabovumudat.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/77f1c3cd8f48c9d4d782fe7786eb1484/gupibadupivalifegatuv.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 17180 bytes
SHA-256: 809b358ce2c83f1d7ffd8dfba112d7e326d3c85626fe7597483f77d519141688
font_01_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 10932 bytes
SHA-256: 9097337f8aa9b69ee43cebd929f1487ec00a1752da9646cfb62da09082e7459b

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