Malicious PDF — malware analysis report

Static analysis result for SHA-256 c225a9dae17e6801…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f2b4e5ec1f5495f5f36f9b74d7ccda1 SHA-1: a0632afbf78a39f217eef6bc676c103b3f18bd10 SHA-256: c225a9dae17e68015dd1771ecbd72066150333bc458ebd47ca7771c5244a3331
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=the+walking+dead+season+1+game+free+download+pc+full+version PDF link annotation
    • http://446888.top/userfiles/file/mogixikuzomijibuzivesunib.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160815ebad0e9e---83255795261.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efe5adb3f5a8bb262ba7f521470ed697/11717854019.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2fed7db1d00918ec6b86da5a7b112bf/tupavixid.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tanolepebidugavubikijuku.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/6c9fe49894d410cd8abba4a0fd9565e9/56917218009.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/21a35e1b8dc6740226e9b557b60cd09b/40563499927.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726e8503dc---binuvefijimuvotabopepi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5874b8bb5---vuxojonapixebopag.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/14438489817.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4efa3f2e---85322913231.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/xipuri.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/38d187c4b25148f93b108e929e5edb10/xixoluladafigosujabida.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8cec98d7---sigerekirovuxijo.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/649eb334deec409b3f55ce14fe616292/rafif.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a12d40a225---debamojexumazidafuwiwaz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f67281fdb---74468222052.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b48db0f1b---wexuzekutujef.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b68694bb6fe28c83769f87e717ac11d4/18650630852.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/15857016430.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/avtm6u03es15h17i7gie2g71qp/juziwevelege.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6081b7290---senekeluwetakesibi.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430061019663853.pdfIn PDF document text
    • http://abpaluso.com/upload/file/26303941587.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c553e8b0---51802719934.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160776c56cf60a---votutetizeguzazariweja.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 17796 bytes
SHA-256: 055d8c1386ecf63ff56f9b9aa538e971bf65d2f0c19dc1297ab4c8fc27dc9558
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 11328 bytes
SHA-256: 7796dd181b04a32d2d831ca3efe048484d55d31e4086537934e9d77706c9e8fe

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