Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0be397bdafa02db…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 08:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cdd759f5724d17cb7ef80dccf75cef7 SHA-1: e128ed3397fc913d77d9cba9a7382ac92708349b SHA-256: b0be397bdafa02dbc828adab23fc9569119d02884ccc3d13356f0c40f3b39cfe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://midospa.com/upload/files/30660137811.pdf In PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/8639402257.pdfIn PDF document text
    • http://www.moyekolodin.com/files/giwefumuxeroseji.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/pedumabojinijogujim.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/83920734887.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132490503929---dowogukabi.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/logazalejezil.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/47974726167.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/ririmejidoxovujogeroba.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/45469092621.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/33445208777.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/42646608521.pdfIn PDF document text
    • http://travellerisland.com/files/nazij.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nozugugasufemivoluvaki.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/17265848034.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/doxibozaluruvafofun.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/21730721215.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/febomijelilitan.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f4899870d01e628f184487faa66509d9/50101253709.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/56157174348.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdfIn PDF document text
    • http://jonme.net/ckupload/files/24221444823.pdfIn PDF document text
    • http://kftchem.com/upload/files/fobijim.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/tijopegojekepowavet.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/17790181982.pdfIn PDF document text
    • http://scarpatti.com/files/xarodev.pdfIn PDF document text
    • http://vecsecity.info/editor_up/26436597907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=poco+f3+pro+antutu+scorePDF 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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 15200 bytes
SHA-256: c760b5f9161c3bf3e1fc85172da6da460a23706da9ce4f0b58893ca4ea8f8cae
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 10608 bytes
SHA-256: 1062f947e1d9e14e3b756efd411c0c2b3d5115ade3fa2cfa341c0116b2250121

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