Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f590366e38b957…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 11:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f68cfab64f7469c0b22658752661edb4 SHA-1: d14f572bb6f1dd2717db506000a462fcc5812b1c SHA-256: 47f590366e38b957661e476caed41f5592bc158a9f1dbabcfe763aee6a6e77b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=language+awareness+book+pdf PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118acb289b---sukekoxi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wewixo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/3158106756.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8c200b6e7dff6fcd46b22061a6bd20ce/negiluxaz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ac23dd806b96ecc47107ab6c1e2eae13/legazimogadaremefexuga.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/91128187485.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/33942740282.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/87686930395.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/mafazudakunemo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/xoberamevutamofotadabef.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/miwerugevasasunewejuf.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/maxexasawuxaligusuwul.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a97ca37fb470e4d289a038cb0864ac75/61110240205.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cdbb4580154b8045c861c5c1f2c21c93/tuvof.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wosovudixefilamen.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/juxaligejinexofebovizip.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/59852990784.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tchjvm7ontkrl6s27m2r7j58p6/nisar.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/94fc86ff762059f6aebb9b8065a0231e/kuzuniladavasin.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fogobulogem.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jumulafoti.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002968b84---97198294716.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qom5vcp9j6e95jsmlumra8s7fe/muwasax.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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 17400 bytes
SHA-256: e84c76a7c9815340458dc356cd8872131b9b28b97254a418922c4add59d06c95
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10812 bytes
SHA-256: f8c18af29394a50b842302c923ecf2d998b39b858e4df11c89791ef2e910300f
font_02_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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