Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a29d00b7a8e912…

MALICIOUS

PDF

82.4 KB Created: 2021-08-15 04:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e316b9d532644f4e0ba46d450a917880 SHA-1: 338a20cf8afd6b5597fb57ef338a1e781a44aa75 SHA-256: 98a29d00b7a8e912f20e9bf085bb5eaa436ab574b9b84a11f26b015b1540a307
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to distribute further malware. The presence of external URI heuristics and the compromised CMS upload link farm heuristic support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dc8060d6f42fdd5d3fc0fe1fc61cb5b0/lisinogujomovese.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04b092ef3---petivujiperesegugewipix.pdfIn PDF document text
    • http://isgsrl.it/images/file/81579109422.pdfIn PDF document text
    • http://446888.top/userfiles/file/wokafowevuguvunes.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/15684220742.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/sidazurefegikez.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/ponujosumowuxekavivokuk.pdfIn PDF document text
    • http://hibertek.com/image/files/20210627_205104.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d05aa75---laxadoposo.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/84252309303.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d88be59e---nojeva.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/kebebita.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/munisefoxisigujidazolujaz.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/84407110269.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/xigamebune.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mukisabaxinasex.pdfIn PDF document text
    • https://akemi.ro/hirek/file/70237551.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fee6c297ff---visesobagebilofazolu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6fa83ae496ad4e99e4f0bd94af803c7d/wetabete.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/94155909206.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066864ea1---bagemelidedakabakajedi.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/93715489280.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8lsp4p02o0kpu9jfifg4hfnt17/28620136449.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/firejawos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+use+bodyslide+skyrim+se+vortexPDF link annotation
    • 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 17336 bytes
SHA-256: cfe55d6bc935eeefb3549ec71b952d0fa3a04728d640eab0205cc8eeda021bec
font_02_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 10832 bytes
SHA-256: 26efc11972a5c69b16fdc352f7cfb2d5413261800bf088c3025e89f1285b94e8

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