Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3b4f7ca0e15b50…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 00:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96685aceaec346b4dac81dc98620b86c SHA-1: e3f95db67228e0dba70ee0d458a479cbd6ab156a SHA-256: 3a3b4f7ca0e15b50181a00088a6fa76b3bcb846bbd102b100c14c251c184b71a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=vidmate+apk+download+latest+version PDF link annotation
    • https://tradegateindia.com/userfiles/file/70619262593.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109031127413259.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xewarejolanu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6ce1aa0be1f528cd60faf6c6b3ebab40/23959807287.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862d4e19d4---99078839130.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/dugeraxi.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/futoxudigepe.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/tuviratokijamexizujopuf.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210914074933_f5zfew.pdfIn PDF document text
    • http://uhorder.com/upload/files/15016358707.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumikalitebevo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161423f84b888d---63292946378.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/misusefez.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/pejugosuzalafasibaf.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/dunanodisa.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/zegaxesulujosiforigu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/lesawigoselijapibepafala.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/57890752504.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370261d6b9c---gamabegop.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/51521922467.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/negirivaxulimakewosoda.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/52320967291.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/16844262769.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/51842365499.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sp5rpkjah884taeorcqqfbcf92/dekuragebomipagijolu.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/63915212998.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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 19316 bytes
SHA-256: 8cd590146137eed12af3a5b0259a5d9b56e7630874cfacd94dbecc2ffd886fda
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001367f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367F 10768 bytes
SHA-256: 724849f6b181e96bad9c593ecf706f2a0c19df4e00196109379551f34cf4df56

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