Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3184a07687cd51…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 06:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 424e693cc86f68f275c4a0901b579e6f SHA-1: 3dc5c25ad2f7e415ccca91e61f0d1a72791b3ebb SHA-256: 1d3184a07687cd51ead134fdbc7d0d517c41dabfa3476a71e8a41cc135a21beb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and disposable hosting, likely to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 https://khonggiansachhanoi.vn/uploads/files/77101371854.pdf In PDF document text
    • http://police8coop.com/UserFiles/file/xedamem.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/36412745910.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/mutegawuxit.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kanizosasigofe.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/28033383249.pdfIn PDF document text
    • https://akconta.com/uploads/files/87397810781.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/17402403388.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b31978e3c08---jovumivulonigisejejemori.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c7db4b094d6c460518c9a5ed8d7951cd/19397195848.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bazodiribit.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec510d9997b---feragivujosoxu.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/25513745279.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/2028998603.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b2be97afab3---56985689196.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/232706aee1eee8e4ba9b7ace09bc0795/venuvawejutemo.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/67030204183.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b712e89ee---82145680658.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rurabavonawab.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/065331791c0ba4ab4d92f0c4b2de1a86/bifidepok.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/butosimixonegeb.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cc1ebf48ebdf6ff37a61d5d4ea4c01cf/85960146393.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/jogekazuzebunezuwoxibuper.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079bbe908100---diwezimi.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f87740090bd391bd8f54b02665fd87dc/gorarigifobopotujum.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nepizukotilagovug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+libro+mein+kampf+en+espa%C3%B1ol+pdfPDF 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_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 19720 bytes
SHA-256: f8256552a03a845139260fa2c093f1f0ddb3fa99a869daa86cb1fc0f709f4267
font_01_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 11304 bytes
SHA-256: b943b574c6a9f835597b677af44acbe5ef1392f669e12465bd360f6c1acb5c63
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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