Malicious PDF — malware analysis report

Static analysis result for SHA-256 1469c6a7935d073c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 07:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6279ec2dc0e0be33254c360961de37f SHA-1: e1833422cd347713fa8cb0f05298521df0b1f92d SHA-256: 1469c6a7935d073c975f40524d5cdce731d54c08fd61d18c710b747dc7a6a658
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'Browser Install Lure' heuristic strongly suggests the document's intent is to socially engineer the user into installing malicious software by masquerading as a required browser update or plugin.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=story+downloader+ig PDF link annotation
    • http://zjhywt.com/images/upload/File/sutonapiginime.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344116054f5---tepevinubiluwevawedegofog.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/mavutijurovanegave.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/40671374360.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/42319694894.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/47776812849.pdfIn PDF document text
    • https://eklyps.net/images/file/12267339695.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/40603751515.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nedubemapagajawisiledura.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/pomem.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/bekapa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/c73f1f79c39d9a20a82cfcc2f4806395/92086165449.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xugupofaxozukizujug.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/53806516436.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/rinodamusedamiv.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/5586388652.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6ba0bca---79039380113.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/53865426775.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/75515910155.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/24168368414.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/xejijisi.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/1756890683.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/14731830865.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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10528 bytes
SHA-256: 51c8144c99d9e508ff963b261c12a718d0ecb56c849520cdeb27e6344ba6b579
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 18108 bytes
SHA-256: 53020ecc231e0d71ad0bd17a93bc7e443ade0efb38878045eb6456a046a28c80
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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