Malicious PDF — malware analysis report

Static analysis result for SHA-256 b460daa038c33f5a…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76f8d93764c1bfd6b3688f2d39356dfc SHA-1: 7c1859fa3d888cd4ffba8e3002ba9290f9e54f58 SHA-256: b460daa038c33f5a89929a26348ed5c96e3be34a5f8248ecee00e272163cc259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=how+do+i+capture+a+screenshot+on+my+android+phone PDF link annotation
    • http://0965818789.com/CKEdit/upload/files/favavomoxabomo.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/49256132641.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/sifezejomu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/981463c5de23902c76f7a3fe1cdc6a97/55776876868.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422b026d1aa---53924244078.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/tumig.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/zorunakovetazevudoparati.pdfIn PDF document text
    • http://0932018255.kad.tw/kads/ckfinder/userfiles/files/2855747747.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/wozoxezifasekomapog.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161414b710bbdb---xosikofuka.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210903023508.pdfIn PDF document text
    • https://onlinendttraining.net/files/68099307895.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/68938151414.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/40876526872.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/sopofovunasilufisiso.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d975156a8---52798671752.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497fabecdfb---dojezopapekexuxuniguru.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/83359040052.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/34139302324.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/81347881583.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145135cbc32c---wepexufab.pdfIn PDF document text
    • http://blueyee.com/upload/file/141706021405.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_off0000b08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 11024 bytes
SHA-256: 8ce213991e621aa47f97177fc55868b27ae80c038749603c78f96e44ee936dfd
font_02_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 14512 bytes
SHA-256: b778caeddbe3ea5ae16195183d666e91e7bd1d602cd1a9b2661495b1233b28d4

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