Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f55886ebfa9a08…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 10:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e20c6bcea76d14cb0f83143db77a09f4 SHA-1: 502e0d15d693aec67076f63831120e96cd970079 SHA-256: 11f55886ebfa9a08382d7a2ccab10562fd2fcdab0c5b292a6f7035a58b0da616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=surgeon+simulator+touch+apk PDF link annotation
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/91860385417.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/99852637655.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320e9cc466c---46492891101.pdfIn PDF document text
    • https://intersat.lv/files/file/vonadivorivezevavotenup.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/29705169537.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161472e5bd775e---waxotu.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/zedozonakibikusewej.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/22694474125.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/49051675770.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/47b5cc986894712122c073f185ced7b4/labarobakedemijajuse.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jobituw.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://bentleyplemtech.ru/userfiles/file/50950318521.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65f1800d5---91443511646.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/kusag.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/sabopifi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/wasibebeporukonipufu.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/62463942207.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/480enhppj8d2ke59prku89h1p6/19118723937.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/29114269175.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/fulafurojisegudebakelavuf.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/13863549805.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/jobugeturexowibilob.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4dc593ff---muvoxizuxukidinowewa.pdfIn PDF document text
    • http://demkapi.com/resimler/files/78183353304.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6a2aeaf5---31601363308.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_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 21332 bytes
SHA-256: 937843e5b4e11da824c2a4713b7912eacc7187d09943cfedc0e6ef28fd206ff4
font_01_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 11088 bytes
SHA-256: 33713480bb31bb780036b86d8b65cb54610d6198a29c0a9595a5a2b4eb1dc775

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