Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d2516d4f5611b0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 15:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92c0298929add4208549d3f73e4166af SHA-1: 968d3276fa0d4144caf1634991a3f333db9ca579 SHA-256: 73d2516d4f5611b0bdeb684ab5b682dccf157ef097bde03a884b797c076bcf4b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social engineering tactic to prompt the user to install a fake browser extension or update. While no scripts were directly extracted, the nature of the lure and the embedded URLs suggest a potential for JavaScript execution or exploitation to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=free+idm+2020 PDF link annotation
    • https://banifatemeh.org/data/file/29264246357.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gobefezorumirupowanopev.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/7743610668.pdfIn PDF document text
    • http://anpo.vn/upload/files/91047205333.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/67738378074.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/likafazidasuluxewatusop.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5743115a---23846723233.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/68f2c973e0f4630320b2e4f4981c0bac/vaveziguvozamil.pdfIn PDF document text
    • https://iwistw.com/upload/files/borapidinolunejepebi.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/jesakidawe.pdfIn PDF document text
    • http://hidramaco.com/files/files/64305452993.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gunokiduxukifofotobi.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/momenexevavevaxetipojaji.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/28176524998.pdfIn PDF document text
    • http://philboyd.com/9715066332.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/fotepijud.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118371acaa---59751136899.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/jatotaxorudawukasezulij.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/bc5e50fd3fd799e2762085c4bfbd92c3/84954783226.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zuniroj.pdfIn PDF document text
    • https://petala.gr/userfiles/file/zudizupu.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109040123384012.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/79497581317.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/31782162164.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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 9932 bytes
SHA-256: 49b622afb46632b4a37721e19c4193b78148038c510edcb4d57a3e06d6c83c67
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 18396 bytes
SHA-256: c528cdc48c1c0495cc8d84d071a8e26b20dbea9b2aa2464aff8d3aa75851e3f6

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