Malicious PDF — malware analysis report

Static analysis result for SHA-256 d014053db3c6fa43…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 19:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aa0331121385abca81e71e18155af6c SHA-1: cd47ce6fb54da43f62ce188dbee8a03776719282 SHA-256: d014053db3c6fa43f6ca7c4f082067e9dae4815924b69d3061fd369bb5a4b5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=unbrick+tv+box
    • http://slhospital.com/upload/fckeditor/file/32909763943.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/nivirugul.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c21f44433---85253478597.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f6a188fa5610770e97f2c51765b6b9e0/99444661035.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47ba8e3e5---80376119979.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/wagepugisebu.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/kevunuzixekofo.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/49193860865.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/joragavozige.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e6fbdfa997593a23742a1fdd4b7da498/buremofobimir.pdf
    • http://scandinavia-ex.com/images/blog/file/novevadafudumisiwunenugu.pdf
    • http://studiotecnicodambra.eu/userfiles/files/zizagakuwutelulu.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25040037456.pdf
    • http://www.physedu.in/newsite/userfiles/files/15940245870.pdf
    • https://razredna-nastava.net/files/31479777034.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2bdee3580b8929b7a81308eec5138bb5/zukodufovabuzumaxututi.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/30314266912.pdf
    • http://cayxaotamphan.net/userfiles/image/file/30649543455.pdf
    • http://kieryk.pl/img/userfiles/file/ruvol.pdf
    • http://changrung.com/ckfinder/userfiles/files/57237481578.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/rukimituvamisuzexiwaluzo.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/pixixoribawebupogunu.pdf
    • http://cantinachitarra.it/userfiles/file/72187990863.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210913_5FB1C76B3857B01A.pdf
    • http://ybshajiang.com/userfiles/file/2021-09-10/2109101254200263815krjw6eor5mw.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_off0000d621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16792 bytes
font_01_sfnt_off0000ee38.bin
bd0ec0fbbf9f48674f0c95e779c2e08cd35c52fcc2e2fa6e61c51b92a1c20265
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10120 bytes
font_02_sfnt_off000104f2.bin
20be6256e8e42af7d7cfb4f5b8b088baf1228697ebff2094f1fd46437fc4e7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 18216 bytes