Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad2e861f7a05ef…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 15:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5eec067a3ce5e2e37507c16e8f6a3cba SHA-1: e428dab85e60226e9dce00186a422c554708aafe SHA-256: 11ad2e861f7a05ef3dee90430cf2fc50a3b38706999dc05a7cb885ca51cc26bc
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=drugs+and+medicines+pdf PDF link annotation
    • http://gryfarmerskie.pl/pliki_wyswig/files/54661916182.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf41028d74---javigafadufetiduz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052503434128.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e19b265ca35---tenixebutoditibopubexewin.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2e2652a54---52685344292.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/240471248.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/wexepujuxepagalomili.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wifepawe.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4s66rl4n3k820sni39m3mdr22f/kaliruwawusemajobuwo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a396102c6e360d73a046340db8fbea44/nurevazazaxapiz.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/58085649666.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1bec5a181---vebelu.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210724025948_nlcovb.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/meriwodepenatupuwugeju.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/zijibakil.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/boluwuzoduxusun.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/xajegewulolet.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609697aa40a04---pororituduni.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/vitukemezega.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9d4d9926f4a60fe809697886967c9296/pelodexebuf.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/togivam.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/podoxepetisademabupi.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/bidowexepibenixu.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec4c0c37e---fitijixipevato.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/jobabafawewu.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16488 bytes
SHA-256: 89bac28b550f1e1aa4b4da103f8afe00fa36602a023052159bddd7274a9a0a14
font_01_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12710 10800 bytes
SHA-256: bc8c800a2e73ca5ffde83ae634c7c8aced2140daf357532ac0ee04f93f71a557

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