Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c4f62ea03fec6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 12:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c36a32060c99b60b0a5e4846abbd473b SHA-1: 3bcef24da36609aea427e825877489d4aa807ed4 SHA-256: ae9c4f62ea03fec6f7d3d833743754477c7c05c6463ff99546e6ebbf1dbb951d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are associated with compromised CMS uploads or disposable hosting. The primary goal appears to be directing users to external sites, potentially for phishing or to download further malicious content.

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://e-sportis.com/images/upload/guposamal.pdf
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/66122978268.pdf
    • http://celyroknaterase.sk/editor_uploads/system/files/30026515019.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/92657536255.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa2c7b486---jumebefisonozexilitixan.pdf
    • https://vr-spagna-20.effievirtual.com/galeria/files/8135374569.pdf
    • https://joebalogh.ro/imagini_ws/bomok.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-01-21-27-39-74.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227a4b7aa1---lewokimuwetijakedotu.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdf
    • http://wamer.org/userfiles/file/49441897285.pdf
    • https://shivajigrihnirman.com/singhania/downloads/file/16162739468.pdf
    • https://seeyounow.net/userfiles/file/peruz.pdf
    • https://dalyanestate.com/userfiles/file/gotufabazisofizo.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/81360748518.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e8cbf108fd9a309102a074e6d22fddc8/47281332416.pdf
    • http://izmirtavla.com/upload/file/58504859739.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7e23d289---xowawowibeg.pdf
    • http://rts-3.ru/upload/files/jetitidabomexod.pdf
    • http://lexxyin.net/files/fckeditor/file/33659892504.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/dea52734b3502569b1e925f9d441530c/zigugininoleko.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/19083862955.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4d45bd1b---minamat.pdf
    • http://abhinavabhishad.org/userfiles/file/buneporat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+recover+my+photos+after+factory+reset
    • 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_off0000d18f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16792 bytes
font_01_sfnt_off0000e9a6.bin
c26182b5a9e87804aada2141350c3b77d12fe2d6f5a630bb4803e5e7c02848fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10912 bytes
font_02_sfnt_off000102ca.bin
f5804a872c1367a3ef73e475ab28f4bc68ebe6ac3c4014f98e288760cd9d0700
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16728 bytes