Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8729eefa041a47…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 07:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53055b7a0588b2d97a2602780f48d484 SHA-1: 15fa1f4641c1216eddf66b1af2e67d05bbe9775d SHA-256: ce8729eefa041a4771c90fd20ea554803f93cec9e7cf72b672b96ff9b9376360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, likely to obscure the final malicious destination. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/56aea4f5b7815ffa8492f2f909bd49fa/26761740923.pdf In PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/wemes.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7a9c6075034696deb13616e3c7fae246/20672428061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ce1ab677---259826390.pdfIn PDF document text
    • https://aildf.in/userfiles/file/6286593415.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/saripepawevuja.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/jowozol.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76fabcc82d---dijeraxo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zalarawegavakegew.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4da380bea15e688fe7a61444f2031754/rezufovamazal.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/81e94f2ff45d18ee29f41e835a26faba/24572879697.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/666816141.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/36778228110.pdfIn PDF document text
    • http://abc-tel.ru/data/File/rusagipijizutiz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608caa980ee42---timenadiwonopofeximoro.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/55540254651.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/vomikupemedikew.pdfIn PDF document text
    • http://cjatkinson.com/userimages/91691230773.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/gukojinivoritijoj.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/sotanizenaxal.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98d549206---luvifuwosupezetage.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/5092755174.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/9730668419.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2lsi5k4j8e4ueeobongqrapre7/2255147461.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2d838fdd---50476769511.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/62702723047.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/26614486306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=little+brown+antsPDF link annotation
    • 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_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE42 14836 bytes
SHA-256: aa14251552c016264c83eb58dcd5888d4d224157dd336a872128b72b8a4b05fd
font_02_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 10284 bytes
SHA-256: 6b14c33c49f7c62b3682d8c7433b9b885eefd7f0bd9d316ad07eba0c2ce2f720