Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a546c18482ea674…

MALICIOUS

PDF

97.0 KB Created: 2021-09-23 11:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ab464cf8bcc3412312011a1fd420cac SHA-1: 7ca7bde657f404d9039d20c37db31bad870b112c SHA-256: 2a546c18482ea6747ff5990f5c904bdb4461ca56cb0989a566ddf508f942a8be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised content management system (CMS) upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a link farm designed for SEO manipulation or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://1ar.sa/userfiles/file/48976717847.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161314267259b2---mamivujob.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/10703068217.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/725a3b4314dc80192b8e1386c08ce936/36754966418.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/1018553247.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/mibomimize.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/safokadotivaniwuwajet.pdfIn PDF document text
    • http://weingut-suppan.at/files/reriwideku.pdfIn PDF document text
    • http://orthodoxnews.us/file/bugexav.pdfIn PDF document text
    • http://nemochem.cn/upload/files/guvovubugudi.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zojomenoximufemaxu.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/savepapugafonu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352ecf7235b---15724830300.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/lodelixe.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vigefuf.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/sidijadari.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/vosafixof.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/luvutoritisamalidixa.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413916dafa8---sadexuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110e50e942---tadiwugogubuvebapizaxona.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1f52839a---49509696673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=love+story+solo+tabPDF 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_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 17848 bytes
SHA-256: f66331d890626e11c00819619ac393546510424393393c485bccabb433273c24
font_01_sfnt_off0001475b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475B 10180 bytes
SHA-256: d304a64255a1cf991d55abf2509d835075f181ed5a948500466637597e7ba8f7
font_02_sfnt_off00015e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1