Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b631046c8c099…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5997035e86ec78eb2ae308f3bca8578 SHA-1: 4ed0a6f9eb38e8590e20c492c97e590d19b687a1 SHA-256: ec2b631046c8c0998aa66826424ffd93b1087dfc69449faa186c4fa65f49324c
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software by posing as a necessary browser update or extension. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a downloader or redirector to a malicious payload, likely exploiting a known PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://adamlegal.com/userfiles/file/20450445412.pdf In PDF document text
    • http://elskup.pl/images/assets/file/61732489795.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/fobepotuvobedesid.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/55141337547.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/wowubolezalepuvotonexo.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210906010535.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/75441544249.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/83734245094.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614436bdafe4f---nijimulewefuna.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/pojunesikut.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/goxemesol.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/68572572928.pdfIn PDF document text
    • https://suncables.co/images/file/22821263435.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/dopefowipo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444312d532---90282202770.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8478849317.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202193845507367.pdfIn PDF document text
    • https://langumeistras.lt/i/File/bixuritofujuf.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/18773678882.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161403ef928a94---42663872153.pdfIn PDF document text
    • http://matras-devison.com/upload/file/monipemirezeselotinazus.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/ribobatagijufat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=smart+view+to+chromecastPDF 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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10572 bytes
SHA-256: 370236414b49f4ad9403e48cb976169d75cbcad52222a4a58eddd9eac6ec8aa8
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 17092 bytes
SHA-256: 7af15b445b37d0eb92e99581d0ec5f590d5b1109ce185140044f165aa1ef84c7

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