Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce51629434c5acd1…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 14:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 311017f5c2c25ca7146877c202eea322 SHA-1: 3002bb7b317b2c4ecbb1a485606deafb75c037cb SHA-256: ce51629434c5acd1073e25d84de0e3512e0b3f26e15173ceb6162b1fb97a9fa6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users through these links, likely to a phishing page or a site that delivers a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.otevrenysklep.cz/ckfinder/userfiles/files/pefipakovelolokedudu.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/pojemimetov.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/forejuxon.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/mezapogiberilelimuto.pdfIn PDF document text
    • https://777mto.org/contents//files/75569077777.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1a2bf071---kepazo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/ledumiku.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/85299652398.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/gijonasetutadatutozer.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c07hip0kp1u0t065jktih4j880/52126688819.pdfIn PDF document text
    • http://alvitraders.com/files/44634232296.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/nevameperemi.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/93834544357.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegedijesatupok.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/65002547927.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/lemoruluwanakurunujakex.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/36493032191.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/699930dfc50cd9c95d602cfac8cdb9a7/43340833367.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/24200078472.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/34aef565a23808a3ab7ef15e79cb067e/tajesozusejolidipufawege.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5db6faf63d6df2d695fcbaa63a8e7933/3833673191.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/5762037289.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jabuzinolidanebizuvikalu.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210823_6EB59EC9FF99D553.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/rotopogerenusolodomev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=locatel+iptv+pdfPDF 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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 10264 bytes
SHA-256: 8e5617442c068276516bb4278fc2ca496a38ec890ac14304855e0a3768bb1ee5
font_01_sfnt_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 20188 bytes
SHA-256: 9a9c86235ce2d64d04a05b1f66ab1edc21cf429b606839b1d799dba707cb0eda
font_02_sfnt_off00013b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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