Malicious PDF — malware analysis report

Static analysis result for SHA-256 c444ca9a804c8ea7…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 16:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b1e5b7c10bce091302fe02ef4b8adac SHA-1: 7ae6f47dd4d3f84e7d1c6e96c6668d59990e5a36 SHA-256: c444ca9a804c8ea76f22bd643fc558a7b1b5962687e07c3dc28e2d840d0f918a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it's likely used in a phishing campaign or to distribute further malware.

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 http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nafekur.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5137bd3---viluruxojikemabilazawixe.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/xexix.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/35362787844.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/remofofosizud.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/93062104547.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/57602106458.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15907005093.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210901_060744.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/33767331105.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/eadef144f0e8734e7c26ceac6b928177/3368020865.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15331129391.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/60373292943.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/gaxevavemugeler.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613807cece857---8132180675.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/wejewob.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/50958320.pdfIn PDF document text
    • http://hkacca.com/userfiles/30276908163.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/55598021578.pdfIn PDF document text
    • https://subded.org/userfiles/file/6277164033.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/71235000419.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/76aujrtvf90s1g9f42le8rpoii/dubofodegutukep.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/pusonisodusidewusapis.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39555352754In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=my+phone+is+full+storagePDF 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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 10844 bytes
SHA-256: 924d75a521cfd6913dc956890133928d36174bc0eaf1a4ee88993a707e0650cf
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 16864 bytes
SHA-256: 83185337d74e6e8908bffee03781bc4deb23340d30e3b82ab673327f04f71ff2
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1