Malicious PDF — malware analysis report

Static analysis result for SHA-256 257e84b10850e58b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 10:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 248483ac397afa2a63d69236889ec1c2 SHA-1: 80bb928a90f8da7dd3b862d67ccd28fb8015c6eb SHA-256: 257e84b10850e58bdbacb54f7d468081e62244ba36c07f183bb881b84d0c4d35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://allamericannursing.com/userfiles/file/97015261369.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///16058922317.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210902130807.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1ef49c1f01f5b8ae25fb636118eff1ec/naradiwinedope.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/9858014159.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/eff69b58c1cae22bcb29163eba27a3f2/muxadox.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/14692516417.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/pijuvulelozuvupanowotawe.pdfIn PDF document text
    • http://szm.hu/userfiles/file/lugubepatuse.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/romugivovutokosav.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/xagomuxas.pdfIn PDF document text
    • http://yilip.net/userData/board/file/45464382301.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-12/20210912151628216408.pdfIn PDF document text
    • https://agatanorek.com/files/file/pakazofot.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fcaa4402---wutirapojatuv.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/falekilavepajekaleb.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136630db0147---tijifigovul.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/wolifimunegamopetiv.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/22157740478.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/jezapubaxiji.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31d0cfa6f---jadawawalerasubitunamev.pdfIn PDF document text
    • https://susta.vn/userfiles/file/gasupotupaxezet.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/28884882122.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/rozotevivi.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wozil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dover+beach+summary+in+malayalamPDF link annotation
    • 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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 16892 bytes
SHA-256: bb0c485fecd1cdca9c1c9240d0d56e4f4afbbc45e0c1640c9df3fc333b961c15
font_01_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 10820 bytes
SHA-256: 2ee6c08061791a747168749b8b9721aedb5f9829914d10ecac8aff307e444952
font_02_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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