Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d1b31bca4bc493…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 09:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 532dec0be6f6a4d1eccd2fbaddcef05c SHA-1: 74ae9e4b77706f4da56aa932caae16fc7e5e40d4 SHA-256: 56d1b31bca4bc4932f2d4edd64e94418a7606104ca31d1c89ccc7701ee195d5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=lucky+fortune+teller+app PDF link annotation
    • http://bakineshr.az/ckfinder/userfiles/files/turejesefixav.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/30922358921.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/waribuve.pdfIn PDF document text
    • https://5uempat.com/contents/files/81230438902.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95510568695.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f19f0c7b---54164057676.pdfIn PDF document text
    • http://cascad-trans.ru/files/18728801135.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/52152256669.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/84555841185.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/43285501051.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210912220619627.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/supovowevevadozu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/towipusogatusenedimux.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614644d492ce9---85072213470.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca6eb66fc---mejelofasopamumevewabopu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613defdd9f4b3---domukabaluvufiwa.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/luzatijoxemex.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbccc953f---lopuwuwewomaxirufuga.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/75752030354.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac3ed290---14099442230.pdfIn PDF document text
    • https://eetravel.net/file/gepukevuf.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904213639981786.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/gesobokukagegizer.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_off0000c211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC211 19468 bytes
SHA-256: 858786e513f19f2ea8e7e6ff5a85d5c353fceda6b7e8a8def44d775fa4ea0b71
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10476 bytes
SHA-256: bae5133bc909994a023f103fc0613e6a4cb7a41fe34a70a0eedd6cce12d61aa9
font_02_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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