Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f4556ecd1af33e…

MALICIOUS

PDF

85.5 KB Created: 2021-09-21 01:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7804b507e66ffcdf641062a075dca6ed SHA-1: 200a6f8d0d7b8c1c6fef06b4a376d6cd3b893dfd SHA-256: b4f4556ecd1af33eb7c4ad97fa5c58ba583717c9d6e00b292ca0cc5421386a3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gldbirdgel.com/user_img/files/45247715080.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kogorimipo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ab7511a29b0926908a4fe08381f79864/masuvijifotijovenekubu.pdfIn PDF document text
    • https://everestart.com/images/stories/file/mununikewejeseruxebij.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/zudixasudagolazelizojomim.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lurejuxanabokowu.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/xazuresugazajokazuguve.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202198148588582.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fidosirupabigozexitufa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea62de6f2---38791897816.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/85614008699.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/pavotusijitazemufijawuz.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/37884285713.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/60092704195.pdfIn PDF document text
    • http://stefani.cz/fck/file/suzezeruf.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161424a60a6bc4---93730560525.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/mejigozasudobame.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sejudowajemekoxujabi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/75652443866.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/wawogojumumogapirixi.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/78027082703.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1632087017.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613904dfe511b---birixowu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b52c9ac9e875405430b3f41fad895087/sowexomipako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=multiplayer+io+games+onlinePDF 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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 17872 bytes
SHA-256: 9324a61599d6e330fa6b6d8c343838b1743ae5eaa3ea96f51c8f5a3839995cf3
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 10800 bytes
SHA-256: b83662694a3a7ad80c9b52aecddc71d1da72d14d3a161844049966b7dfc6110e

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