Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a66a590a4eda6c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 08:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88d261eb6e6a74d1f29d5d9d2daaa9ae SHA-1: ee5f901bd8277ebf4a45a15aece4c77eede24352 SHA-256: e5a66a590a4eda6cf49df40138da4dd301fc42ddcae9c39811b71c7cfc7a634b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://oniceh.ru/uplcv?utm_term=toshiba+tv+32l310u20+manual PDF link annotation
    • http://westernstudioservice.com/admin/userfiles/file/98421585906.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4a458daa3d7f1257c976653a64884854/wujojifu.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/35741934708.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/nivutusob.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/39vtqjhkg1c2ilkn0i2f9vfhl7/82874392211.pdfIn PDF document text
    • https://phuquiland.com/upload/files/posade.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/85233915041.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/kuralad.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fagalofute.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2a3ddc489---rolajetipirego.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/kao1rrsj539qb3aledbv6vknqb/voxedupaj.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d883d5f38e7---zolakoja.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/pefapilijixedukafoxip.pdfIn PDF document text
    • http://chromatographvials.com/d/files/juwipogitile.pdfIn PDF document text
    • http://szwygs.com/upload/zowokujev.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/worapibetaborajosajugafow.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/82001923792.pdfIn PDF document text
    • https://anfauglir.com/images/file/42985898426.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/nemeromurabeboda.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be40c7a62---zejut.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f5d70596c6166969984ebbd57c41ab1e/11981739592.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/23161608256.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vasovemabu.pdfIn PDF document text
    • http://modero.vn/upload/files/lukusanopopoxudunamubaz.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2694d06bf40c3fcc3be131fda3ac94f6/84068133631.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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 10876 bytes
SHA-256: 3efc4a999c50e1a08c78f69b12f4874f39b88c7c6e10529ad19fb8dcbc66395c
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 16980 bytes
SHA-256: 0c5a9564d525b2ab2497a4136b735994376f416d0701b5aeb4b767b4cc6025c9
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1