Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd78a2dd82947a3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 05:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1e0b927d114b45b01e8c9fe138084a9 SHA-1: 2146f86715260976e282684b8ffcdbd546c6c02b SHA-256: afd78a2dd82947a3051215790337cd1b88606fd300df0879ebed04a241b3340e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=are+all+jeep+wranglers+stick+shift PDF link annotation
    • http://rauvuonsach.com/images/uploads/files/66646046093.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ab79da282037ccae9ff3d585b7442770/fejusavigawaf.pdfIn PDF document text
    • http://labotinnghia.com/img/files/neremuli.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc700b55b---83207339906.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f0a6836e---midenimufasug.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/67695614988.pdfIn PDF document text
    • https://basisangka.com/contents//files/64955652144.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ej0s9inc85p18cb1h5m0as85mu/soberijafumuxel.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/88681687754.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/lewigupedisagapiru.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nimojekugaba.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/294e40ad988d6489d28b8295e4fd773a/mogije.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/27e0779f7ddeaca74cc4c14263672db8/vugiwugekonidivusali.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9fd79b9e---36973669988.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/30831273517.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/35921132034.pdfIn PDF document text
    • http://debten.net/UserFiles/File/94178875646.pdfIn PDF document text
    • https://senhewood.com/d/files/zivigagelusenodifisulofa.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/78949415947.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/99402855825.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/bafibumijuge.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3446f86f9e---25483726362.pdfIn PDF document text
    • http://gabortech.com/admin/file/82612176700.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_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 10928 bytes
SHA-256: 7f8bbe1039d51824bdd1c2f42b3e9ed7c92d44617a76b3e6cb05f9ba8ba0e33e
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 17132 bytes
SHA-256: b0f0c84fb4836ea2ff503ec52ced781d5f94226162cafdb600111bbdf21fc0ed
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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