Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8cba7f8e663f01…

MALICIOUS

PDF

92.8 KB Created: 2021-07-30 00:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67662ed2046b5f423da5b27b5ee56071 SHA-1: 60a1f9321d3919e4b141af6363ee32a36c77cff4 SHA-256: ea8cba7f8e663f0109f158855f806be5304e4e3a9f433a793ae1921c63cc1017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS platforms. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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=adjustment+disorder+with+mixed+anxiety+and+depressed+mood+va+disability PDF link annotation
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd77aab87b354c93d1f84b683ab9c4ab/34939693655.pdfIn PDF document text
    • https://tcremich.lu/files/files/45817269292.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/jozaboxodesivusaxe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/75241477769.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/89427735138.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/rukivevaj.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/fuwike.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/suzogogawafu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/99ilh1puutbm31nid5j1netgv2/2798214129.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/neruzukukironulelagis.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d3b808276fb83b62f9d0c3bedd48b31d/32149018438.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/kanazudanikerenusugag.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///95976525540.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074015a99b4c---79713906593.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qqs8l10da33em7ep9ujbdhss82/66700642644.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c43aa246d---55326159140.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3802203ef6346e240a4177f459ce0c7c/77669781590.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/24e88657c69927dc8fabfcdc77b6e224/70594564052.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/pisojuzusularuwame.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d1gjjov6v0ucmt3demgu696nkc/80478904331.pdfIn PDF document text
    • https://kawanmto.com/contents//files/sodupan.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf140e2ab---pomobuwovividomug.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_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 16940 bytes
SHA-256: 2623b1e8f7f70efc00481aa8b54b0c33a32a855965e2d8411b89ab085312bb0d
font_01_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 11376 bytes
SHA-256: b04ddef869c8b52306ed8978c4555dffb18909a1ca0e773ffb99954b0f62c11c
font_02_sfnt_off00014ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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