Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f4379ede0bdb27…

MALICIOUS

PDF

69.7 KB Created: 2021-09-29 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 67df2e8ed6d18a775e661357bf779ac0 SHA-1: 411de297f8d8823217881328f77a55065288f86b SHA-256: c6f4379ede0bdb273772699c9b0991d77f10ceaa8149a08f27a577ef73bee227
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=blazor+component+library+free PDF link annotation
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/lizimebudumebebomof.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/pexolusiforewavev.pdfIn PDF document text
    • http://ipceurope.com/assets/file/86136666491.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fagosuterobagukepunaxemo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa33e82ef---48790371455.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/fajuxofewenit.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/85447985944.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/23663512944.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/76850471217.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/vefekub.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/68601799519.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/76948602002.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210919175900.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9fb7f1d2---kubulodumukovonujoz.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/87862184236.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/16593275852.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/55098231266.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/wuradinanokoni.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210914113553.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e185e691---47679720589.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f3fcf6be926ba0fda52a77314a0f6029/51743274959.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/6512999242.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_off0000ae02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 16172 bytes
SHA-256: 4808192b0d322cd1efe5789ee7ea0886a3b8d26ec1fce3a4a253a4b89bf9b99e
font_02_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 10840 bytes
SHA-256: d7c2d63b1c7b963a821b9e1a52045c40cd77242a453bf5b09118b940405e2ff5