Malicious PDF — malware analysis report

Static analysis result for SHA-256 24274a4fa3f42046…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 08:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a41062c5fe448267c545d54609a9b88c SHA-1: 5ea7c24d1ab4641718269f7a3379e633e21d77e8 SHA-256: 24274a4fa3f42046bd227938af867c4338b14b4b6dfec17f20e3552e026d15bb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=bos+bos+game+higgs+domino PDF link annotation
    • http://iphysiology.ru/upload/fevufavunav.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fb39167b1---15876061941.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3qjam497ctv3sn5i85vgvqefu8/lodopuveditod.pdfIn PDF document text
    • https://qkon.ca/images/file/ruxoxunajuletav.pdfIn PDF document text
    • http://kasand.com/userfiles/2733661035.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/55110234130.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a061623920---gupaf.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/37880107067.pdfIn PDF document text
    • https://anandalaya.in/resources/file/85723419246.pdfIn PDF document text
    • https://webhosting4.net/media/file/90224826967.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/60121885309.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27bc50d5c---25093593969.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/11216893984.pdfIn PDF document text
    • https://cncunse.com/d/files/70320260786.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/kopikinodotirenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136665200e2f---dovitutefowobamugo.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/52783681814.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210910_033835.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161325f7634e03---gejodizufuv.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfbc9b1c---nuravo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ba536c15---julapowoge.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1da80114---54471989902.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/60856034447.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ffce4252---luditib.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/vavajakanonu.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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 10644 bytes
SHA-256: 42612c506d5580359e139d59467fc4309702fce32806e3386219731093c39583
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 18060 bytes
SHA-256: 409c29b294023dab9241697555687a1fa2c07a317fda0ef0a63108eebd365898
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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