Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4fda4a2c2bbad…

MALICIOUS

PDF

91.8 KB Created: 2021-08-14 16:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 588450c7a6bce7190396b4c294d3ff27 SHA-1: 6d8df0741502b9791c9ca62436f937044d01e7c5 SHA-256: efe4fda4a2c2bbada0b58af31a2c2d11fda774187fb20fea6815c9eddef547ff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious or SEO-abused content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a3bd3c31.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608426fcdab54---zejedegodegivamulinaz.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/77318062683.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccaa99a82---68324052614.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f280339c660c7e51768ac44e1a07d47f/82080164296.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/85466114286.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a4578596---85185772233.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/folugarefexamexewujanad.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f713359bba9---jopagaw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e907f52e---lokenefunusatisenetelo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c9ee78404694c4afd7d7948fcda3e7f7/xogubenaven.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/25531840630.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/764707eefb6c2383deec076a7c1c267e/nenukerixejetutamemekomu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072697152d54---57566108419.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/36417441232.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///dewibopotetujanitirotid.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/24454036440.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/rezefetalej.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fopolavi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/il1kaivckr1cvgd621u4gv814f/sizizinowe.pdfIn PDF document text
    • https://777mto.com/contents//files/vimozogi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/63170ddd018facdf8895be3981824230/75483364920.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18fe4aadf---tekodafozewifu.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/luloxodewemaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=moldes+de+letras+del+abecedario+para+imprimir+y+recortar+grandesPDF 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_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 11104 bytes
SHA-256: 6d0d7482c9ead3ff3b6f59ac9f1715e51fbafe109027aa43c1b7d30c32e3ef54
font_02_sfnt_off00013144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 17968 bytes
SHA-256: ec928e628b72f56756dae72d937dddac817cf6714b9dfb8c8afdcea8abe16036