Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eb0cedb04741ac…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 00:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7a8e5fdee5e9d5d48f9508ba8481e65 SHA-1: b9b1283dce3459f2aff7a3815eba0903db8f8c64 SHA-256: 45eb0cedb04741acd03a6484a8ceeee110fa2b4ab2c5ace75029d9352b7cb51b
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to disposable hosting or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The embedded JavaScript is likely responsible for executing the malicious payload or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=lewis+medical+surgical+nursing+book+pdf PDF link annotation
    • https://wodepcb.cn/uploadfiles/files/rotaxawutivorafewipug.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/k0v8k4osdo1d9e3epdth4e7i0g/16349124115.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/63eq069sjmi1iakfm5pt0cps7v/18663279239.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5130935942.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/1559998984.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/73540667779.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/56834929112.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/xinataxixonib.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/6460186673.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090401562624.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/72167219818.pdfIn PDF document text
    • http://workontext.ru/media/file/dewamite.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/66181810803.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210913034744.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1541566886613ce65d6b322.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/wamijudadek.pdfIn PDF document text
    • http://bankerz.in/qpic/files/zenatizu.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/17290885405.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jomexuburuduk.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/joliregilumuwokifef.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/nogekagoxepamakugim.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/vamaxodipa.pdfIn PDF document text
    • 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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 11240 bytes
SHA-256: b4be4bab799e37006bc7efd6302e540b674adec6990f4d538edbf166742c994a
font_02_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16272 bytes
SHA-256: 35398e22edd6585b0ce76fb9c0059afee15a8855d3be25ccdf82a9dc62a515fa