Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c14b3bec785e8…

MALICIOUS

PDF

91.8 KB Created: 2021-07-16 18:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6acf4383ca0b7c2afefce8ca4bdb53ad SHA-1: 115a08858bb4fb0056c0c5b010a119e785f69dbe SHA-256: c36c14b3bec785e8b99a185515d2da83661a3508a76735fde5e43172852dd656
196 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. The SE_BROWSER_INSTALL_LURE heuristic indicates the document attempts to trick the user into installing a browser extension or update. Multiple URLs are present, many hosted on compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://tayles.com/uploaded/nixibubikodibe.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qfsarqgv3r5ubaflhg4llm341d/retafudurarowezom.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195e37c6---32288766517.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5632447b---sawedoredugofagafok.pdfIn PDF document text
    • https://koratspring.com/upload/file/zofovodesoku.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92102598356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d1fd4241d---nukowepusowilaxosojo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608889055a08e---wojavonejazubenumidawi.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/28422300011.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/56691356604.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/33c6cc3abf6d66d3c0d4c4b34708c47f/42403594042.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/jitakameneviguwilazawa.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6bda73057a11afec3d39f87581fe05d6/xoromakaw.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/pubebobodaxoxelu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/jatepefupexe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a882c94ee---tiditopaja.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/ronimurolad.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/5280509796.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4662dfa47dd8ba688c834e491fa4472f/61251856186.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1f8e6a618f063be115b3879c5bf99c24/xemazawamilugokiji.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/21991901646.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tiradadetejizulapow.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76eb508a8b---88231059496.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/rabajit.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4l41fmfvr8aj13r0jslu8kmjeh/bolokofodam.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/470gtg2eh4a9dn1e6oi94qg0ed/kavatolapobuvuxafesat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=read+out+loud+pdf+softwarePDF 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_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 17112 bytes
SHA-256: 1b47687f4a43e54bcbc3b0a627f1b061a725c8e8e11ca5e130cf1928d934bb7b
font_01_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 10524 bytes
SHA-256: ca2cd32dace3ea8867194b3c49b19dd3fd522e74c6dca368aa1898f020d70494
font_02_sfnt_off000149b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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