Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdf04b03d16e0a4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 06:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e2740dd795bce01b343a29cfb1e54b8 SHA-1: 1bd0fbabd675aacda973e5320d673cdb3c09a98f SHA-256: bcdf04b03d16e0a4eb1b8c89f65ce280d9948b8e209f5dd429657da38aa8dbd0
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or social engineering attack, specifically a remote-support tool lure. The document's content, though heavily obfuscated, combined with heuristic firings like 'SE_REMOTE_SUPPORT_LURE' and 'ML_NYX_PDF_MALICIOUS', strongly suggests an attempt to trick the user into installing or running remote access software. The presence of numerous links to potentially compromised CMS upload directories and disposable hosting further supports this malicious intent, likely serving as a distribution point for further payloads or as part of a link farm to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://happyhanool.com/ckupload/files/mebuporaxelifow.pdf In PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/98872872276.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/95852733133.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c215b452324677a9c4b74ba61889fb2/1260221134.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109191107123693.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/40a40749a2187fc72cfb746d8b4567a2/33858271991.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091415113286.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kanikomisanivarasegi.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/16223532890.pdfIn PDF document text
    • http://www.bash.cl/media/file/66201335929.pdfIn PDF document text
    • http://telecycling.info/files/file/43164331821.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/98379296637.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/93258478609.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/58284975536.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gixodumokosido.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/17969225421.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303274c01a3---daxutupamidakokibekezewup.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/nixuw.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442658572e6---8964602995.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/91530736679.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/setofatobajevijeda.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/vegiki.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/koxuvunazotexerojo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/84068946305.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210904233709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=share+your+mobile+screen+with+other+mobilePDF 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 11008 bytes
SHA-256: da9218117e479d565b8ec9ec0114c284680b07baee2160141b18c1fe9670f4dc
font_02_sfnt_off000114bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BF 17968 bytes
SHA-256: cf602d396052361392540f7c45549a9d50131ea522f3c52bb94acf012786d73c

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