Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88789529ea76b42…

MALICIOUS

PDF

241.9 KB Created: 2021-07-20 21:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae1b511f9a43a067c70655c13096ba48 SHA-1: 73669ced3a56f7ab468ba160fe10784708046aaa SHA-256: b88789529ea76b4243f18ebef3aa1d34cc2c82f34143dda7af04eea121399174
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded links, with at least one pointing to a compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple URLs and the high detection scores strongly suggest a malicious intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e9c919d9---begob.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/waxosavinejofuz.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50136dff8---nopewusisavunegabapijunox.pdfIn PDF document text
    • http://azizolace.cz/images/file/vivevezixixibeleleli.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f508daabf95---xulawesojelilonujarenu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c571492ecc4---kufodutevujegeguz.pdfIn PDF document text
    • http://derma-dts.de/files/file/xefexivopimukanudaxana.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/79952617238.pdfIn PDF document text
    • http://jarosi.hu/files/file/73129008804.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mevifabifadolukuxiso.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c89343c354320be2877b5f2e057caf0f/2314923708.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/20651006051.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab624a5f1---xixefixelegokusitadipefef.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dabe91aaf97---wubuginonumozop.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb183b77f1---54341466177.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/jelagapapadudasag.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xajapowobatevi.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51791061282.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/61746621387.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3qhcp1e8aa97jiubbg066ogi9o/sumizegotopobefekipav.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/14142034234.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b2fd2cd208feb6e57eca002ee60ec156/57621587532.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b54306d238a713b1c27ce72ac198351d/79514100426.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7d567adf---86364296215.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5865c282c9---64584470644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mystic+rectangle+synastryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000341c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x341C9 10392 bytes
SHA-256: 66702337fb317842b537b9f7a9daa227e334fbd64673624862392ec8b2f9fc97
font_01_sfnt_off00035970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35970 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00036ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000386f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x386F8 18464 bytes
SHA-256: 766d650a3c783298b4da7ee9cb867665b01c5d29699c164bd719cea2489cfe80

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