Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb19dd0605f27feb…

MALICIOUS

PDF

101.7 KB Created: 2021-07-27 09:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9f4e8e8cdb5fd9dd21d2c958803f4957 SHA-1: e6a61599ebb07969a943de55d74ed85b8324d4bb SHA-256: eb19dd0605f27febfafa2fb069f88c1a1ee8f992dcf0d2e415d6a6901ca8344f
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://datavincity.com/uploads/ckfinder/files/40252920982.pdf In PDF document text
    • http://first-group.kr/ckupload/files/81430973648.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd2794e1d---zofadu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/fefafigilasetavebu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24d44990dc---gekijumikubefivarapofupez.pdfIn PDF document text
    • https://waroproject.com/file/91250220071.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210705_195554.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8b1f121---22970569948.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/15533757985.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779caa5659d---48522524011.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/kamokotedokode.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/43045450552.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/ruxajiv.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e9696b8445ad9b5f330285432b7d86af/juferebekaguruv.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160869bbda8914---votumanumugelapukofuxakug.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/wunogigireb.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/fobafogedojanivofelisaf.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/89439712778.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7ae024a9c117be718b72628b7ef4cfa5/xepevawitobidas.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a4683170---78511301684.pdfIn PDF document text
    • http://goref.ru/files/file/2304576330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lfs+unlocker+6r+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 10528 bytes
SHA-256: b8ee8953d3714038ab09b67f1ccba58b4a4d723936e4a30a3445e7496946b490
font_02_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 28092 bytes
SHA-256: 658932ee673ba009d3ec913d6dca232eb7010c523b76d4beaa2690b096981331
font_03_sfnt_off00017d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9B 2064 bytes
SHA-256: 5e203d385e0ef1368bc35c8e164ccca6dd430f69a62a650a7b1bc2ec7b927716

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