Malicious PDF — malware analysis report

Static analysis result for SHA-256 431d390a3a3f4216…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0508c008e5950103981b344211a44027 SHA-1: 87a448a42b0821119d9e5f74cf3c88801c64cc95 SHA-256: 431d390a3a3f4216c8312151e5e29bc88dd7674f2d8b58f70debbca5f9554a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using such documents for SEO poisoning or phishing lures. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=holy+priest+rotation+shadowlands PDF link annotation
    • http://aliguoriarchitetto.eu/userfiles/files/luzubazoperejofasabunav.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/89307376602.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/83a977150b031211e09fad0fb213443f/safuseresamaxidanodov.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/gujoruna.pdfIn PDF document text
    • http://berbun.com/user_img/file/pafowinut.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/42486775891.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa925193---43887770572.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/ketugurarudaku.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/72200024298.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/nixijalojuforozote.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/63994355612.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/fusoxijivarizorobixev.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/59054292455.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/dosaton.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mobovupikediratowapej.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/65225092172.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614235177c395---46529852221.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/63212537461.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/nexogojonorudarinut.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615214d17fd9c---63075689180.pdfIn PDF document text
    • http://artdental.hu/editor_up/fupazegakitunalituvatuwop.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/65528469604.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb983ea288---wegasi.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/98589119855.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/77307158570.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/vivotukowidakivene.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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 14676 bytes
SHA-256: 02defdffd8dc19e5bc16d22c3ac3218134948a06d24e56f2af42e69629680e11
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10680 bytes
SHA-256: 5943e3cdc37add45ade6d06f486d86395ac5ecdad088513ad0418f36277221db
font_02_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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