Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dedde35ac63a50…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 16:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6c1dcc69b78ba7980d86f81de13b8c2 SHA-1: b9a29f97f149e22861728ff156f053c11e3a251e SHA-256: 26dedde35ac63a50d29376b47d83af56c52c9e0898a0b44b05cdd40672be3c9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS uploads. The PDF structure and embedded links suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b50bfe75335cbf68f31398ab19d31776/61581068379.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ad3d7aab357b91fa55eb4ff546d8087f/67419671128.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/77482742649.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/nilorovizu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/36584137e6ab68d269b3199436c456bd/96287674437.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/metujukusefixuxu.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/dopogugabovatakuxe.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/20798845053.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/66704685502.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/semutuvaxojo.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/zedizezuworixoka.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da906907439---88788886365.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ch8f0a6j6otju5tqrp6v2pvun7/nanebatatatakuzunaz.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6353e02bf---51629166765.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5ad92604---lajeto.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080c35c17168---83270238069.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/21332816153.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xiwivutisamuguw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f780714e47---lopaxe.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jegosewugakutarefe.pdfIn PDF document text
    • https://purefeeling8.com/data/file/65005908195.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8spft4eunjbn419hp80ek450gn/rusezi.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8s6hpnhmgdc8humrk2oqkanj8s/99062436228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=financial+reporting+and+analysis+12th+edition+gibson+pdfPDF 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_off0000b661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB661 11304 bytes
SHA-256: 856bb25f99637f40fe65c25784e09fb42858e4b5106b648ef7c0940bca7e1fe4
font_01_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 17100 bytes
SHA-256: 86ee3e9dd6a8a941436a4ed2ce2395fad0ecfe733fd78c79cd5bf9cc5fa761a9
font_02_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1