Malicious PDF — malware analysis report

Static analysis result for SHA-256 4913b4f52284562e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 02:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 007ce66473f4ef33e28a838bc2b48751 SHA-1: dff68a78b86ce09d1ebf7ea4741dc8ddf781f9ab SHA-256: 4913b4f52284562e9bd41f5b3a9382c885184ee5ef73df37a82d259768a7ed9a
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 websites or are structured as link farms. Heuristics indicate these are likely used for phishing or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=game+uno+android
    • https://polaria.cz/images/file/40106034660.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/20865657216.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/gugapizato.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/92839846740.pdf
    • https://worldpigment.com/image/upload/File/38924946245.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/sanafelitoxomiwekakugegej.pdf
    • http://nemochem.cn/upload/files/kemivubelalujogituzunere.pdf
    • http://www.pzkexie.com/up_files/file/13350247714.pdf
    • http://hoachattn.com/image/files/60806901293.pdf
    • https://istocdukkan.com/userfiles/files/40236123064.pdf
    • http://2m-m.eu/userfiles/files/396306191.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3e0cf067---ruremikorefigajetupeniwe.pdf
    • http://dighakanchaninternational.com/FCKeditor/file/xifuri.pdf
    • http://telesson.net/_UploadFile/Images/file/jelaxekejovagelakutizu.pdf
    • http://arabic.cz/ckfinder/userfiles/files/52799903342.pdf
    • https://jjcfurnituremaker.com/userfiles/files/15300601700.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/81256831042.pdf
    • http://esipro.be/userfiles/file/rinabadibesakolexizudizi.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6e74a83b20370494a1d7129189fe5834/32772670307.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503dc9fc8---lasovilezozezage.pdf
    • http://studioego.cz/userfiles/file/59946718392.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/870d9e6365923c83c870024961225642/5255170252.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7566130d3---nufesebogusojodalewuje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e868.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 16792 bytes
font_01_sfnt_off0001007a.bin
6e729f98718229614a1da91c9d5d7513a4d451217c31294d460bf118a4eaa65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
font_02_sfnt_off00012bef.bin
9e55eb93b37a80a1f0ea3ec8cb4bf2b7d14971a8ce67e954d254e8dedb7b56ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 10236 bytes

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