Malicious PDF — malware analysis report

Static analysis result for SHA-256 e521218dd66114cc…

MALICIOUS

PDF

81.7 KB Created: 2021-10-09 07:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d86b4cbd9082123e295d2b830cf7852 SHA-1: c6b8d1da6b81c85f222dc6391103ae1bc3147d5d SHA-256: e521218dd66114cce89b21839eb1cd8d6f56bfd722f8ebadd81b373d0cc6b06c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, directing users to various external websites, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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 https://tecnomatec.cl/upload/file/63824091853.pdf In PDF document text
    • http://mu-rrrc.com/userfiles/file/gegaz.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210904104957872.pdfIn PDF document text
    • https://baongochoa.com/upload/file/64719813011.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/bifapikelubezebabesejo.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/jaxinodaloka.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b35812e8a357247d1a9208716bbdc5fc/wemiveliror.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/jovenidefuzolivesugoko.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e28e74b3d---66266823428.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/55337354407.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/dujimasovolinidinivux.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/44236848654.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/779a293a45d16505202ed37e8bdf065d/8363822547.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/zutaxo.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/sukuri.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/mawamozufozinoruro.pdfIn PDF document text
    • https://alohasafaris.com/files/68326390168.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/21087001159.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/nibel.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/77719310690.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ac761d295b0b8ac30df531fc35db349/rasefiwiwezepuzivaxuni.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/luziwi.pdfIn PDF document text
    • http://medica-brno.com/files/64425946171.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zakipa.pdfIn PDF document text
    • http://harlit.com/upfiles/file/90771831122In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=my+middle+finger+is+numbPDF 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_off0000dc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 17396 bytes
SHA-256: 61e241a2aa5a50a7945d7a47f4f6a6fce348f768b53c91bc500ad1aa76c9722a
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10664 bytes
SHA-256: e8a73fbff36a60706450dc9c716310d702c9a4b9100fb0d3ff3b49e97828f032

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