Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb4b9f21081eae4…

MALICIOUS

PDF

83.9 KB Created: 2021-08-13 13:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21ec32dfc926680cf5b55a8b6ebe89ff SHA-1: 53396a96ef78cabc271e3ae1eaa145a054ed0dba SHA-256: bfb4b9f21081eae4b86213af440930dd882641aa603db7d065754a7702927fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, such as https://krisoc.ru/uplcv?utm_term=how+to+get+serial+number+off+hp+laptop, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=how+to+get+serial+number+off+hp+laptop PDF link annotation
    • http://terralis.eu/catalogue_dynamique/file/zipogonufuguwesobigiz.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/nuxobupabisiwolatiwo.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/vakitapobow.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98d0a73eb---boforijovimorubonadigup.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/jenatubexorog.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/92f2e49ed37d953cb4da55ad79e39747/78127889841.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/81528950088.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9aac63fff---xarazapedutatuvexo.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/18792014223.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/lah0us9hmc37pllegaot7jv436/10067090334.pdfIn PDF document text
    • http://juha.be/_files/file/67015083892.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/difebagolupixefuvod.pdfIn PDF document text
    • https://masukpt1.com/contents//files/67423419705.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sikefenu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/62321550508.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d445778603---zijewezewilodexoxis.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/mogumikokimitegesat.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fbgng30vqmjud1bb99h87rslu1/45885489499.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/fixeve.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161162a82aa913---92288125961.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/77241939350.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/7bfdc196cab538626929405acd0c11c7/99294057802.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/tdukdgca30uvp7k9nau7t9sfpr/rumikuduzuzefunos.pdfIn PDF document text
    • http://partnercable.hu/files/fomimetuzokubizorafo.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/ropogubisuzibozij.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e2ad492b3---79168323271.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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 11124 bytes
SHA-256: 6174e593d82bc4945b8919ab2192db201a9c27deb120c7af9f4b99ee72b2c7e2
font_02_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 16336 bytes
SHA-256: 405e504e288a8a06562f491ed92d8043cb6a982c5527895b222e120f63d60638

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