Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ddc1023f5f7fa0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 23:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bb29288ebd780ec94cab58073e718eb SHA-1: 9b01e4b8288be37cc92aa886ecd794410274c076 SHA-256: e5ddc1023f5f7fa05fe03804ff62cd16a488e0ba28a707f8726c96a657361def
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://lrm.mcdonalds.ua/ckfinder/userfiles/files/sopedeferor.pdf In PDF document text
    • https://specialgarden.ro/userfiles/file/dejudamo.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/59977624066.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/mikerisena.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/89408194054.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/84586986521.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/76971506703.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210914142605.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/12375095714.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f0205858cd41b57f7642797b61f29ae/6412062246.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/16397592423.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/sataregenezuta.pdfIn PDF document text
    • http://dezis.ru/uploads/files/garewepige.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/mudofol.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/kujasamukakorene.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/96751848075.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17ad4268d---75988787757.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pitukesatopexulog.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/kamutezuzokomi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/36h81v87qhus3vkdknipjmspgr/xinaporovadazobu.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/13389423837.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464041dd67---sajiferafafurevo.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/25907700995.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gubej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+links+auf+homescreenPDF 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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 10816 bytes
SHA-256: 29ababf28ed4a817e5bb0635f99370ce1fb626c5d06d9290fd7cc41843db1b7f
font_02_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 18624 bytes
SHA-256: bba375ed17dedb538ef22240412a4d0230b25cdfd8323bff7e3dade833994745