Malicious PDF — malware analysis report

Static analysis result for SHA-256 df99d89516238f89…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 14:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c60922e7c25e85474e02a2fb1d02ec5 SHA-1: c089540506dcfc11ac8fec43ea8cbcb42f379738 SHA-256: df99d89516238f89a3c9a298d8a3d4cc246d28add5dccc818f5f5df3c38110ef
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension. The embedded JavaScript likely facilitates this lure by executing malicious code or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.channeloflove.com/ckfinder/userfiles/files/kamugenunimebalavunuke.pdf In PDF document text
    • http://portaldo.eu/contenuti/upload/file/10334509067.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/6993486004.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/firewirebot.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/pogatuzifoniwavowujipu.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/38444232242.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/24606156645.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/72858819982.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/29559777587.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/zifuzet.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/15418203318.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a938f26a33---kujavupepaxezalilap.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/gewozaluli.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/93749559500.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17dc1ab1d---76175525633.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/komomulotetezamesepire.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/luruwani.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mizawopore.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/14901427905.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/37991888807.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/74448481886.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bokizivepidulo.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/ragepudewarufapuj.pdfIn PDF document text
    • http://newcityhk.com/userfiles/84012630934.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0dae429e2f1c363b0c21a27eb395ca3c/85852475223.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/lusisetuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=block+pop+up+chrome+androidPDF 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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 18472 bytes
SHA-256: 73ca5a46e475a8ebcc1109669e63b72ba5a6c71feb454a9737786ddbf872a15f
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 10756 bytes
SHA-256: d063c1ed30e0f07a4afdd93e8d405b2e8b9a027a4ad7dfdf088e369a0324b717
font_02_sfnt_off00012749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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