Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad093c1b39f89605…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 21:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6527befba586a6a13befc62ebd066e7d SHA-1: 923e6c18d6bf72a83d388821f1e456e83c52e4fb SHA-256: ad093c1b39f8960501415477a65d376c6108595bf709d4f7692be9cce1feffbd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/nc48shbugcfrpbch8d7non1ira/madokagemujumolevu.pdf
    • http://robwalker.net/fckupload/file/13097170623.pdf
    • http://csc-020.com/userfiles/file/20210902020635_wh01v3.pdf
    • https://kingbakerypans.com/userfiles/file/xojetofupo.pdf
    • https://tckontrola.hr/files/5032637961.pdf
    • http://sp3siemianowice.pl/userFiles/files/nanisoz.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b709a61db1---sezolufuf.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/65369013579.pdf
    • http://ilturismoinitalia.it/userfiles/files/30032599185.pdf
    • http://originalavto.ru/userfiles/file/dalujuriwejenosumiziri.pdf
    • https://brianhigbielaw.com/UserFiles/file/kopela.pdf
    • http://perila-vrn.ru/userfiles/file/86206695194.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/75173175650.pdf
    • http://ruishikaishi.com/upload/content/files/2021/09/20210905113545.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/lorukokijiwadusasuforir.pdf
    • http://misterholidaysanprisco.it/userfiles/files/8486170215.pdf
    • http://kenhuffbuilders.com/userfiles/file/28190832928.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69ad6a069---20467262529.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/mozipakilulo.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/tetaripupixedo.pdf
    • http://wu-pao.com/upfiles/editor/files/saxifozimabolorajaxe.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/fisazefomozun.pdf
    • https://sayurmateng.com/contents/files/85522639379.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613798e0c3fc8---36715971917.pdf
    • http://abwingsjanaf.com/uploads/files/29543800693.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wwe+2k+mobile+free+download
    • 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_off0000d9cd.bin
5e8e6159627e6bd9e7e2da9e45cdfd3ea2115793b928764b112edb64ca96fa8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 17372 bytes
font_01_sfnt_off000106aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
font_02_sfnt_off00011ec1.bin
de472dd1a3f8913cc1e61465cd3c189d7e7ace3026b8a2714eebad7c829f9f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10680 bytes