Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac58fb2fff415d66…

MALICIOUS

PDF

92.6 KB Created: 2021-07-02 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95a5214d8c7ac29a8da5ca5ecb7b99af SHA-1: 84e9de1c39e376baa9594b55eb7e5145ab6bf539 SHA-256: ac58fb2fff415d6690cb53407d18999ac2f3aeaec2952037da041e06ac6689de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://medvor.ru/uplcv?utm_term=dhs+to+inr+today+rate PDF link annotation
    • https://contabil-fiscal.ro/mm/file/nenelujo.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b1a6d903e40e2f080762efc1c991812b/newugib.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2d160f3d79db0a58377f547fd9d75cb4/95853111828.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/64408365743.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021626055346891.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb8a04e66---58973605345.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/8736790568.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/678cd5a01fae477b955db71a9e0406e0/dolilokuxit.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16235239404.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5bqqag9vctp7rjpg9cqbdjkojd/91050037456.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/vanutabutelezodep.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/46341369854.pdfIn PDF document text
    • http://belloverde.net/emailer/file/sobutazozadafekerolamid.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210607_08437900DE37ED6C.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609582d68689a---laroxigutuwutelogolopuv.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/17226269533.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5acbf681---fefewawoj.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1669d9144f1f5da474d88c6d0ffa/43502692954.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/52362479436.pdfIn PDF document text
    • http://wenxuezj.com/images/File/17038504235.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608da33810dfb---gekawekowa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16528 bytes
SHA-256: 4b5ecc5534f7e490a6bf9f4855dec53e71492a91e9858e6198ab8dee893e2912
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 10416 bytes
SHA-256: 32552f08436b095422578b2016b5defc8f9854b00fd718a33cd4aab6938777ce
font_03_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 17516 bytes
SHA-256: 294f73ea6e013d4885ffdd4db28a85537f7b7f0c52cc7bd809598ca0692a17c6

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