Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe18b5ff13b4b46…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 01:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cba2802cf6bebd440e51b45e016ab7a SHA-1: 33cc066f3f4b6767db8856c9c3758a8278675302 SHA-256: 3fe18b5ff13b4b46f30eaa36c852dd40208e6f94ceaca2acee6fc0d8cd75ac2f
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 or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bekkercoon.ru/ckfinder/userfiles/files/76808517928.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e19214aa9665387cc8cad19a643a13f0/befewiduretonanewabowi.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/15632280677.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/pejewogif.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/waxogibarefuj.pdfIn PDF document text
    • https://2acontractor.it/images/file/44429225469.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/girisu.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/botewerepatuveni.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/10423200229.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/90084762829.pdfIn PDF document text
    • http://gekon.net/userfiles/file/33845742946.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6eid9608o6br8hddjg4ovipa0f/pepimimejiridekoguxe.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/20551017989.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/57524ffb582b04fe384513f4c773b43f/migazukexolaregu.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/wemimineluzesu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614469e7ae60c---vizokukitazamil.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/13103922371.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jozak.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/44315512581.pdfIn PDF document text
    • https://attack.lt/images/files/67915284069.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/9861421246.pdfIn PDF document text
    • http://profstil.az/userfiles/file/61463331392.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_70EE563EDB48C75E.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/69826290080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=any+two+letter+words+with+vPDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 10432 bytes
SHA-256: 30bd7f513549fb8ba9f458a54f6fab6733f03612c2c04b749d35d32a99a106fa
font_01_sfnt_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 16872 bytes
SHA-256: 2454b82068d017b7fa1957eab43f761a91ac9a5a01e8d71376006dc830ae2b3e
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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