Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ecc74d689c570a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 07:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3585003056c9468ebfd5706530dea68 SHA-1: fde458d8f0f69fc349491470ec507551f3922105 SHA-256: 51ecc74d689c570afad5cb6898082e2cf1607ad58d6e7edd9aa2396ffcdbe08b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=superuser+x+pro PDF link annotation
    • http://klusjesindex.nl/images/uploads/lagonaf.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161453fddb8c9e---vafixubutesasevila.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/safesimaxadag.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/48292280902.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/fidegamejepujanezajud.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/6543852653.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mivigan.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/23939566747.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/warutitef.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/38205660526.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/97275925870.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/58767482118.pdfIn PDF document text
    • http://stringladies.cz/userfiles/269060862.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc78c3700---gadugi.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/jewixew.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/funorodozubowiz.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/26801577630.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf3c5a981---74945376090.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/46455527279.pdfIn PDF document text
    • https://medius.sk/userfiles/file/karomugodejizebu.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/5274851651.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b2a3e4d12226dbfcf9631b0f4aa4165a/48509797454.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35962748329.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/42426496270.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/pemufobexenoge.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_off0000b890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB890 10020 bytes
SHA-256: 8a0f9c7b5c878f21131633af9c1eaa19977b154f9e09b98a59912ff3a138f5c6
font_01_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 17396 bytes
SHA-256: 1d01de7488af29574c447d7116d697857a2608e36b1e5f9202434879f6eea252

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