Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f6b05cdfc9ca5b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 05:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4703e8b52a92d821b336a9d5a5d71178 SHA-1: 5db436cdfea1972f4b66abf2a83fe503b00251e0 SHA-256: 95f6b05cdfc9ca5b58036399da3798ece15923e473f47d8a527c357a81b2c4a6
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, supports the social engineering aspect of the attack. The document likely exploits a PDF vulnerability to deliver a payload or redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://finliz.lt/i/File/waririrakagexe.pdf In PDF document text
    • https://camgloberealtor.com/userfiles/file/64812644797.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060247392859.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/kosoxasukojefolo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2fda5f5abc8084dd169efd31dda73327/fagelevisazofagusar.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/bawubapiro.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/6263369470.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/ripizusorilemefasewok.pdfIn PDF document text
    • http://www.moyekolodin.com/files/valipotikajinexamoka.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/buwarudetuvaloz.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1d28abeb---23846524913.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vibilefamavijegavukuzo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/desazupizu.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/datepexo.pdfIn PDF document text
    • https://maturana.cl/upload/file/vuvojepivepesalekeze.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/refajotugowozum.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b277197335---wedavoxapugegorim.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd229ff8aea4b9a918ad947a1d2bbcff/ledisaxedunu.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kugedak.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xufoza.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/tiwerirovidenovaken.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/xubisemokanukifenakugaze.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9940aeac---94429916331.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/64295370057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=can+you+find+out+who+looked+at+your+instagramPDF 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 17432 bytes
SHA-256: 9f77f7764260a519d008dc7b8f708a2f69da6139371ad4af3bf1eec1781b36d6
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255F 11224 bytes
SHA-256: 862aba60196d312f49616c9287d3b82f637814373a118dd0396d253f4a676acc

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