Malicious PDF — malware analysis report

Static analysis result for SHA-256 225e7f59f135f1ba…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 01:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49936897c0db9acf11cff5b110f6665b SHA-1: 3de191770a0eaf9e83960b673920172cd9881c66 SHA-256: 225e7f59f135f1ba12e3cc27a0137c2558718b3d91767ea5d77b17a741cb84a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to lure users to malicious sites. The presence of multiple PDF-specific heuristics related to link farms and external URIs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kingdomofgodmn.org/userfiles/files/jokukejatasupedupegu.pdf In PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/58760227085.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16071f518a1b65---61382712791.pdfIn PDF document text
    • http://medi-sen.com/files/files/nilidutedes.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/mevurolozumiwolilulive.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/92701551760.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e82bdadc5---50544994986.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/jasegomerasevonuwapam.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/95162302701.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/11993404826.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-8/20210608141924375620.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/abc16f10e43e1d443f4a85b2c864576f/79405494071.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/7jmbp0uloda9eecet51dcghkqv/mogeruz.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v5ujfoo3ns03a7dqhq5sth92rb/bexakavadasol.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/19530977358.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fa6ecab2ed218691b18cb3b21dc56902/sedobowegagotenivarab.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/808ffd363e7eb3d5f13ce75da1d97f23/denaxisuvawiririnug.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f210971a---16776757985.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/xubosaredijor.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/24781299916.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afac936d25d---vegozupomikazawunopubuk.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607625e94d93b---64686144426.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4d6c3e79---tonutefazumepumumek.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/67cdf3cbd521531a5f0e3dd48c80dd38/seminasivexuzudetaf.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dc32d100877fd85244d0653d2dea11b5/68299166169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+repost+someone+post+on+instagram+storyPDF 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_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 17024 bytes
SHA-256: 2328e1efd93e4f2abf3c32cf9b693838ce1931954d822095e1c4b549cbaae336
font_01_sfnt_off00011b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B95 10740 bytes
SHA-256: e8d0d687e9a4a3d19ac813d82eacb5874dc19f59309943c2c88d1248922fab9e
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1