Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee52c742e85ca8c4…

MALICIOUS

PDF

76.4 KB Created: 2021-08-26 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f576efdb566073cde9b80c0a07179176 SHA-1: a986cc768f53162e8324a6a948b10405f83b4c32 SHA-256: ee52c742e85ca8c46bb7ce03f915bf9e87339c12f424363cd77bb44b9684e997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://globalcircle.club/userfiles/file/19171200186.pdf In PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/gerazafilupikilodi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d0ae3c187bae640b312d7cccc513f8f9/84614069241.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/18284843087.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/xetopawisekoziki.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a7195fca---28091244864.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609455b5dd397---99992612183.pdfIn PDF document text
    • http://0930actress.com/files/files/kafitali.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/69788936460.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/79508099997.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fde3ae530---valosedutedelore.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mupitilefigawojusibisari.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/soruz.pdfIn PDF document text
    • https://il-gusto.com/images/file/60063806582.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082889c7eb4b---mumigugegunopin.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/51406192605.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857857d0057---vexigegosumanalidipikego.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/jefipakugusix.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e60ktc7itn8oq208f5ren8s0nf/37661017372.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1bbf68d71b06a646df3e6072bb457b1b/woxoduf.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2ce3840---vevimuga.pdfIn PDF document text
    • http://www.puhito.hu/uploads/negadoxope.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9498209e3a3bac5400e5758baede4c2e/1848365304.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5b4032b62b076c2abb4a47fb4652099c/jugelipegomajid.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a121919e2e---fupurizekasobigujura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cleasby+vigfusson+old+norsePDF 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_off0000c579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC579 18168 bytes
SHA-256: 8cc3ec7a8ef67a3db986172dbe847f482c1951d8d7f4de9b1f5961898fe30174
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10884 bytes
SHA-256: 45cc63064d602c1714b9e00ebcbc50f4b40e060382595625aef4de8654ead585