Malicious PDF — malware analysis report

Static analysis result for SHA-256 410684ea04e95766…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 23:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6b6368add767d938849f344ebca1781 SHA-1: 40283723ecba4fe7d0eabb030aa9bbd2255b48a2 SHA-256: 410684ea04e95766e66f7aee32311e498b2ed89504c877cde2b9c64234ed1e9a
164 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 and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://winkeleninzundert.nl/uploadimages/files/12335786790.pdf In PDF document text
    • http://majstrissmt.eu/www-data/file/12131811077.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/83480600048.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31446408295.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bavokezabewuwikefoja.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/neruvubotiz.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/34094343455.pdfIn PDF document text
    • https://epiphanych.com/images/file/25131546718.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537d22d20b---palikunotezumojoderas.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e25cd5357535678a764521dc897114a8/repizin.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613628f55d611---lojofukesemimasilesubuv.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sewovaxot.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/32912356641.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zapiwajilunuxotezavapoku.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/31439201014.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/faparovi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/numegagudovazapaxava.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/65917470277.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/8643070586.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/75312798409.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/31651554646.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b43981e84b33ccccac56bb3b0678a8a0/75539314050.pdfIn PDF document text
    • https://istanajp.com/contents/files/mitatexasezesefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=smule+hacked+versionPDF 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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 10872 bytes
SHA-256: 580a7f4934db47a2a39b452b004b0759a84710a830a1272f8bcf024e4b26a2b4
font_01_sfnt_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 16428 bytes
SHA-256: b2efd210f773d8b3a5ebace2b8a2ab025fa53e949bf4057c078ce6c3311f5e98
font_02_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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