Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dee23227ddc9d4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 23:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77fb89a05a3df9b246f716ab5779f993 SHA-1: 49d2cb84c2e0420064e8825bef15cd4ed03713d6 SHA-256: 99dee23227ddc9d45d78747fe646b81d5435c13810a5e67804bb40c47b504296
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to external sites. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://laborke.ru/uplcv?utm_term=age+of+empires+apk+mod PDF link annotation
    • https://ewastexperts.com/userfiles/files/65231807955.pdfIn PDF document text
    • http://anindecor.pl/files/file/15557788778.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fawizunirewo.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/27780096345.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47627788197.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/jolixezamekasidusizemi.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/35107786785.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/molemowolu.pdfIn PDF document text
    • http://umartravel.com/files/kifufevedodozekevexukole.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/banosujute.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/gurijunenifejemutif.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/wibovopijivuwulabixejafa.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/16988729747.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210918075151_518732947.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/kegazazaboluzonivo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b94cdf5---tanitofelinug.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/gimakekonidutodinad.pdfIn PDF document text
    • https://unosms.us/userfiles/file/94420778131.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45787767291.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7e09e97b---2526818625.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e989ac667---148577752.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614091c0182a1---47816486624.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84293896586.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65731303146.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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 10664 bytes
SHA-256: d117a7415dbe676aed82006a704e50ec1a6bbaa62a60ecf564b8ebdde0f3e85d
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 18144 bytes
SHA-256: 700b1aa6d8b106ec522c41d4bae278dd178b8aa590a681833b4a0042d39c4816
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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