Malicious PDF — malware analysis report

Static analysis result for SHA-256 4926cc25689d2215…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 08:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e176fbb39dc5696693a8b5b9371439c0 SHA-1: bfbb98468893abf04150061331ffc1c1eebff0b2 SHA-256: 4926cc25689d2215aa66f958eaedfc36cf94496a92385fd6737ff4199229f577
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The document body is unreadable, but the heuristic firings clearly demonstrate a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=nice+adjectives+beginning+with+m PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xinotufato.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/karej.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/gobosot.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/53265661801.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/84965014304.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614390ea9b419---4894061291.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/kabamaki.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kusubukelenafomimov.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/50504242608.pdfIn PDF document text
    • https://fuoriscena.eu/file/11722330381.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/44283291293.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c77b30960b---91915646880.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/69620464048.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/3898146817.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001f58ca96---31655924289.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/91500632398.pdfIn PDF document text
    • https://buyafranchise.org/files/files/95958726050.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/92928857547.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/94883477792.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/efc94a45bc6127ba61b1ddbdb58d3b97/91564916059.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/86183767258.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/64d9d6fb582863d9bdea07eb6cb3f099/kujolofatakapuzoworuduz.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/35983763440.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/wopukujoledek.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_off0000bdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 15908 bytes
SHA-256: 925109cc40cf12a0d882487a8c7c08e32a5c87a23a4101e494805c5593736a17
font_02_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 10952 bytes
SHA-256: a6dcc21b9dc0935927a21cc1650875b02a6ffbd503a972d4f77a11be0612beef

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