Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97553765fdeeb44…

MALICIOUS

PDF

72.7 KB Created: 2021-10-05 02:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5466b2f6eb7582b0c43ab13826d90697 SHA-1: ce8226759fc7692dea099d7f255b97a61d1558e4 SHA-256: b97553765fdeeb441a08be495b35c435b09c0c1ff71a7f1fa671941f19ad2c36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://nomylo.ru/uplcv?utm_term=small+lizard+with+blue+tail PDF link annotation
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/73283315723.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/nanumotukofivoborodagem.pdfIn PDF document text
    • http://autovoda.ru/upload/files/54322807637.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/vilozuzufozevovixokaboxi.pdfIn PDF document text
    • http://allergya.news-read.com/upload/files/15902410544.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/21365832787.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/lavajuf.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/47353141017.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/869923d0b8d221fa845728d39ecd2089/87169748139.pdfIn PDF document text
    • http://gzwep.com/img/file/202110161159.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/wajawiposozomaputaro.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/66900285656.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/mejuzovi.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/gawifuwa.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/58439518249.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/pebiwitomixokuduwigakudod.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d19c34458---11020923405.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/31280278009.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a78f08bbbe7884d5ea887d3859d4d967/kinuwiperuv.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b888ba1047---30590546589.pdfIn PDF document text
    • https://akconta.com/uploads/files/97975075821.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c54d039a512f6da6d2d744c40de0d021/toximudumixabe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a3a5645ee9c546e815a1532f564b6d30/69877662442.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/musewafobobamegozo.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/58196333168.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2949ef7ba38dacbfbfd1e808b466610f/5733919758.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_off0000bd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD83 15292 bytes
SHA-256: fa594e8a69c24c82b93c172fd11e1a00cb95bb2fcb4fc53b510c81ddfa072108
font_01_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 10584 bytes
SHA-256: 70e20f6fa638796680a2b7ecc5cc0570a83b21cd2b6ea594c2ca8af29f96f287
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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