Malicious PDF — malware analysis report

Static analysis result for SHA-256 9965a130f68f47a6…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 06:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ac6ea027968c91914482af0d0ba9a1d SHA-1: 1e65d1dabcce1e4f9e18196afe4bfb575121cf91 SHA-256: 9965a130f68f47a61b3f0a2bd8c024e568aa8c5e24b93772b652bd15dc9c43e4
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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://byty-pardubice.eu/UserFiles/File/zapirijoju.pdf In PDF document text
    • http://generoussecurity.com/uploads/dudubon.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/tinenopororiligol.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/44011956806.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/86652526664.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/86792394792.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/1133070367.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d483fbd---1219090919.pdfIn PDF document text
    • https://zhansq.cn/upload/file/polem.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/gegaserimupodokujufas.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/dfb870661b881e4fefdece05bb1a2ea0/julovajavevokidobu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/849e36f14ce0c0af10d43cce27757a35/88611865023.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/vadujugoxudir.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614740e8acc17---45660254554.pdfIn PDF document text
    • http://sushi-belovo.ru/files/496129491.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/44121578425.pdfIn PDF document text
    • https://vzglavniki.net/data/file/mudunosudemijamamufuwo.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/nujozam.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/39432879147.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/11410329272.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/maxepaguvinojalaroze.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/bejuzenene.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75888825602.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/47733527753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beauty+plus+beauty+cameraPDF 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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 17168 bytes
SHA-256: 3fd6de197dbda64d8c86924212061b3aaa1a4dcdba1c0c78a44e1d0bc063c9a9
font_02_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 10624 bytes
SHA-256: 4df088c29aac05d8325ff4d229da00e3c9bed9b16de6f55f6b94dbad7098bfd8