Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f7cd7f06050d0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 03:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 297d4e819426bdaeb5543ed45c442ae0 SHA-1: 0b888a055206747cacd5269d4a3b2c70dc0ee2f6 SHA-256: c25f7cd7f06050d04d0fb5a6c5626329aade0420dd64c3b14a82239040a926ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some links point to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/523c3f02ec6a00f3e5501f9a5e2e669d/5818799373.pdf
    • http://airelimpio.mx/img/editor/file/noful.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7acfe8d927c048c5a9b737ae440af818/66882641077.pdf
    • http://ndt-ultratech.com/files/lowexamagojoxemilefone.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf59aea40cdc3af67e6c7a48637b929d/gogatotasuvikikikiwekad.pdf
    • http://www.saletime.gr/admin/fckfiles/file/gabutakisodezawi.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872faa1904f---47998012149.pdf
    • http://magiepourenfants.com/images/mediamanager/file/66191766739.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1629027505.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/bikil.pdf
    • https://oteaexpert.fr/cite_imgs/file/39629098990.pdf
    • http://moscowprice.com/content/xuploadimages/file/rijukerolapexigilifo.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e2cb4bf3418078b39ca80fb1ed24c63b/29732068055.pdf
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/38398644552.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608de609c9c1f---19950332167.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210804101936103.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/74315535437.pdf
    • http://metabolit-plus.ru/files/file/lisubuvoxofite.pdf
    • https://deitratech.com/userfiles/file/kajufu.pdf
    • http://goldenrulelodge24.com/clients/860883/File/xolideribelinixo.pdf
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/5298883449.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=product+and+quotient+properties+of+logarithms+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d412.bin
276dd4d0dab62ab34e599106987740fef913ef5408a7b54da5d6272584188aab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 18024 bytes
font_01_sfnt_off00010394.bin
038f54b9ec5e39496ee873f1aff7d398f5455bf422c7d627ec9e74100b97efcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 11492 bytes
font_02_sfnt_off00011e23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes