Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8207536f6e797f7…

MALICIOUS

PDF

88.6 KB Created: 2021-08-14 22:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 26fd8caec0ae8ab63e6adbf9d85984bf SHA-1: b1d2bd50532b5761e2b75535c12a744c3cb6cef5 SHA-256: f8207536f6e797f7de2cc4c83102f060312a2fdc887d5c02fb88ee724df5ad29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6402da1571---sawoxalu.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8d11398018dff280851193c19ce18784/dezavafuzil.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4180477460db139394e7a.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/jobexowazasunukiz.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a780586d456---52886842377.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160714749d4739---zajom.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/kaxusad.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/lowumobuzelowaxusiluwoko.pdfIn PDF document text
    • http://tcihk.com/userfiles/87719691812.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994235da74---luxezerakasinumimoj.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210703_145008.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3926defe1952b83aedbb35b1b96edca8.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ae17fc75eea1dc2d39251603f62d5871/53498868776.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/24875228116.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0a2351905---78857920422.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f830ef115bf66c3d5f2be12b73de2c5b/34506065965.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7dtpplr3h03ceh5et9dn1knobn/muwilepobowonejem.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ses09fou4se7kk61ts4jl400ks/4977560854.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/bakoraxobo.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627613648.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ba625n5tarvo5mi5mnfb2ckkeu/79460278040.pdfIn PDF document text
    • http://dzbnf.com/upload/file///21876952624.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/81340933668.pdfIn PDF document text
    • https://petikdaun.com/contents//files/50151946394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=abominable+snowman+movie+2019+streamPDF 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_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 17260 bytes
SHA-256: 7fba7e4da177079cc79686fe5790fdc91ef1877f2ece4025086687655b5884cf
font_01_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 11004 bytes
SHA-256: 6db21867288ebfd0d5ecd2f22a8f8639f97e06342f3076add15c6226cd8aa04e
font_02_sfnt_off00013c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1