Malicious PDF — malware analysis report

Static analysis result for SHA-256 a855a489df5b4a2b…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 13:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9430086394e71c40553042d33e92db40 SHA-1: 825f5ea2392a570cf332102ac06cf44aa02a4030 SHA-256: a855a489df5b4a2b0d10c08ce19190ab47decb285daa27015a7514b9a7c93ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=naruto+shippuden+ultimate+ninja+impact+download+ppsspp
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/aeb31d5ec23686319081f5f0933a169f/11527416501.pdf
    • https://rendiamovisibiliglinvisibili.org/file/golakakulebujoxubagavija.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/71681743674.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1980b9d6ab835e387f911ce54f41abc7/visulujepukirekaxilen.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a59cb79bdc2---60259320237.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff495a3abe---zatidejosisuzotuwifaxumun.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f34ee04ba4---tuwakafom.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/h3pvtl527a4lmu5mioosuqkbje/tijadorugizisivap.pdf
    • http://talleresjpg.es/img/file/vugironerovomes.pdf
    • http://dent-pro.cz/pic/file/66673500120.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c5805b27cff447d596287e1f80c0637b/nudidisasudorozozemepibu.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/767d6203dadc858d45c78cc7a2142a73/gazivevexemef.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08cbad89b---muwemawiwanenu.pdf
    • http://mamam.by/upload/File/file/forewadizi.pdf
    • http://enricobarraco.com/files/53280371336.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074f97b46a18---40526293219.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482a45d3a8---vebasevetapezil.pdf
    • http://washchienluoc.com/upload/file/45406515488.pdf
    • http://anatolianlgs.com/userfiles/file/80619627405.pdf
    • http://lg-palette.com/upload/files/60552648251.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/8378327782.pdf
    • http://phuocthuan.vn/images/pic/file/tugobewuji.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9b06c2c---84859421722.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaee44d07e---zonamarib.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972bdb96bd8---15035602936.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05a.bin
041c45ac40531b2c41a1f6d87d4e5edc7c711045945fdc55133e76a5933ce93f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 11072 bytes
font_01_sfnt_off0000fa02.bin
12b67ef6d46fe9526db86f37df6c4172392d6502e124d5a95d922c29ed708119
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 30228 bytes
font_02_sfnt_off00013607.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13607 16792 bytes
font_03_sfnt_off00014e18.bin
a0c77d14ca1f6956bed5fb1cae73a935ca1d948738dc61f0b6f9612ae193b6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E18 17036 bytes