Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3fa97476b2ca94…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 02:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5744f30fbd753d967adcb709f470633a SHA-1: 7a1509860773d797402e453196b77b775227f9bf SHA-256: 3e3fa97476b2ca94279c0b5f02d33b40d09ffbc433541e1405bfd9f83c4eef51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised or disposable hosting, likely serving as a phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this assessment, suggesting the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=harry+potter+3+read+online PDF link annotation
    • http://shmgec.com/Uploadfiles/files/sagorafafipipokobixada.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/86234033149.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/82546157388.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/93462944893.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134dff38b1a8---7658453321.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fff39c4cd08ee43e7c173733878da02a/82905476304.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/73003148153.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/22576433360.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/12476157669.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jozuxitozobukate.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/57157720713.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/felufisanoviparak.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vitaxudumom.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/zarajakanekagirewovuvo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210915205133_lfh3wi.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/05b59b750846dd6f1bd0b77a93289907/nomeduk.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mekipaxetadukanemajevu.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kulizujogotulogakusedefag.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/17642426227.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vexubose.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/fovanagimojagepapi.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109051416009993.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/48327122418.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/bavakotegu.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109131819092901.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9dfa3e9033ad6c6ad451355be6b22071/gewirilupuzu.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10492 bytes
SHA-256: 6792f549584c2d9262d60390f7d7a1db0c9b38ac928e01ce50544833569fe85b
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 16980 bytes
SHA-256: 35deb675640658e9131cd68f23dc7ddf468a6c861860fe49e41829b496d807ca

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