Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08a35c0631ea7ad…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3d81469f7a7078d1432c2a8cf6230630 SHA-1: 4d22d61a89203104663edea713ec097d296025e7 SHA-256: e08a35c0631ea7ade191a97828f1aab868399c6c8fa416f015e9e68552fb834f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress uploads or disposable hosting. The heuristics indicate it's an image-only document designed as a lure, likely to trick users into clicking a link that downloads a second-stage payload. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=is+47+a+prime+or+composite+number PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d2305fa64---39329209818.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/lavafopavogedorono.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/35698674997.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/pefisepuwe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/9e6bbe8de4ba1a030153b4482bd67017/nonazefubodewoxugiv.pdfIn PDF document text
    • http://plise.org/userfiles/file/sozeridijukuwugoneraro.pdfIn PDF document text
    • https://triosms.com/userfiles/file/tolebaguzibelixajuke.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/82100715371.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/vidowuje.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/sowat.pdfIn PDF document text
    • http://cobweb.janci.net/upload/files/13747939756.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vagadaridamidekusagudatiz.pdfIn PDF document text
    • https://riwg.in/userfiles/file/dukokisi.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/99888367573.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/8643758979.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/linemod.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b3268615a0049af7cd8f7667948e2a84/famevusenibotob.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/47684155011.pdfIn PDF document text
    • https://dalba.net/other_files/File/89314031635.pdfIn PDF document text
    • http://capri.lt/userfiles/files/897322068.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/wirekalivuvunawokeloz.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/wozogatopojew.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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 10808 bytes
SHA-256: cf68e321f0d1b62654622dcd7014e2201f3a5d5506e228eebd753fb8dd734129
font_01_sfnt_off0000ca48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 14396 bytes
SHA-256: f8171f0c6b7a5dead69cebd09f0b724319e135acb12bdd34e1e14dd496f05057
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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