Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ef0a4150a0753c…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f96eada426cacbd9e4dffdb37cd896ff SHA-1: 5fd6b788fd6e65131887ff98dd09c144bec97605 SHA-256: 51ef0a4150a0753cdfc7a326f0897a9d60218722a9a5b3d6dbf6819c33caadaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=numerical+methods+by+vedamurthy+pdf+free+download PDF link annotation
    • https://eyetracking.pl/userfiles/file/lojaxunasobowom.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/suresoso.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18387185c---24487820925.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/40eb77f82aad07d4e61b638ba4efcaa7/88404944768.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85b9cf3ac---xosepitemodojiresosowis.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7eddc914e3b6668167bb8400f877a463/saradiresuxobapifozo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a2bcac45---55315049766.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/6eokictrjc2kvb0labvhsmpdv7/folunoweravabuwurag.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5f9d51bde51d2a224420c794946d0df0/vujakozumaxero.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e4a7faba9ae5a3ffd081d121a9f3db8/861657540.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xabuz.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/71aec2385b8168001908f3c1c5fa1e78/xelakerevuvonifede.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/wipilunogulelu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef77c2dc35---waweboputafu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b83019b6947---63005912093.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e34196d5---dirogexifunatowefomum.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/vuwukosijukuzoni.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35112562392.pdfIn PDF document text
    • https://majubesar.info/contents//files/94570650992.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vokuvixubidubo.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210529104336.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/663acbc7e4bc91f2aca4c54a6ee9fc5c/85754298789.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3e5a04f1b514cc065969726bb3d86493/ligakotisede.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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11368 bytes
SHA-256: def0abd1aebdf8c6be8e7f4fe1988dcf1601d7453666a2df43c7462481c1d041
font_01_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 17160 bytes
SHA-256: a62205687ba1e69cc4ff2b36a2666fab26100766bc72940a4440a3e04e555189

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