Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fed33cf8bee2624…

MALICIOUS

PDF

95.3 KB Created: 2021-08-16 08:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84ad666642b9ba314ea8347cdb3a60df SHA-1: f2d5dd52d9aee9b051fab04a5460972abc12580c SHA-256: 8fed33cf8bee26245d33f81deeed816c92d7be89e38ce4ad02bde6c8fff57de8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely delivered via spearphishing, to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://drafthe.ru/uplcv?utm_term=oxido+de+bromo+v+nomenclatura+tradicional PDF link annotation
    • http://isdoor.ru/uploads/files/86747219784.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161171f9c7cb23---52751896185.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a224755b39---bomuwetitu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e39ff1ae7---kirimogafibidej.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/56997049583.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc599830---gawetakegunufukuzulaneg.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/nuzewofirigediteve.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zisopo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4d11d382331537edc27b2e7aebc1a9db/358632517.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/kadabobisozapelajex.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b0ba6a77---vigudixewakonob.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/sokixasivaxuxasix.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160811237bd70d---73085860363.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/17360713363.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o8dgnatp64io4t2u72j0e7a3j9/jezexuroliwisefa.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/6794243785.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0109139cf---68082584728.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/78131250580.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/40811411671.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fde565f93---1468418511.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bead1b94c1d---74072871736.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/sinuvonimepitosupu.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/58513840299.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/16073426761.pdfIn PDF document text
    • http://twilaw.com/files/files/lejuwegun.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5cdaea351---zutoribomereredupaberi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b019555f1333c904c244ab0590bf917d/91881477996.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_off00010e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10796 bytes
SHA-256: 434d5bc8f0476a697f17af31b592064133f2040509481639b364e46a7da58428
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 17860 bytes
SHA-256: 059d889a0dbe79cf7b3e5e3339b27c01a443bea26fcc6380d003cb99425adfa0

Open this report in the interactive analyzer, or submit your own file for analysis.