Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e49f5e57ed0a601…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 01:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f49ac3dad02402a8a7bec2b71b1e054d SHA-1: 838a1d414cb9cc027c38f9eed44ed6e1aaa5be42 SHA-256: 8e49f5e57ed0a601a6a665a027ffd7d8e608a175aed35a54b79ab51dcce0558d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tantusmarina.com/UserFiles/file/pilubuwufo.pdf In PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/79752050582.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ba1c70c2---dewimasivimedubifeteguvil.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/bozemomanunitevabeteba.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sigerimusaxafum.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/626236cc64b139c284573e2ffc334677/mudusepadoji.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/61973712843.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/38067675025.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3c8d4a234e8f81f97cc5ca54f7660c85/tevogakefabutawupigozoxe.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/kewepujiv.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/59575773429.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/dogoduxomusi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cc30e38ce2b9f636ef639a0f7edd601c/8688862781.pdfIn PDF document text
    • http://showpelec.com/data/file/20210815_055840_729.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/fezoxonelaxerukawojekiv.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081313002846.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/rekogoko.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/da103f26b7610b7aaa30a6053e48a949/46606597610.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/6632423147.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/warivanabixudaxale.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/70685467420.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/misuri.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pjd3250dmue3p2bfm7lpv794m5/nopesazatemed.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9t35rhaqbslcn8evnn1s893m6s/35564988307.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/voxizemikak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=thomas+kuhn+structure+of+scientific+revolution+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/63324002936.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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 16612 bytes
SHA-256: 83a5e2d5e34d20e1c3deec57878fe69a37fbde893b6f575b8d9a7997c9a52d65
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 11104 bytes
SHA-256: 4cfc3b8c078916d15754cd4a4d48ab4678a5a57319d239a5c9b461e8dd1480a0

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