Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ffe5ee7d35783…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 14:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93bd87ad5b9844c6a74bcee889976979 SHA-1: 020e35a3b257f9ef9d02fc7d516d933009d62a21 SHA-256: b23ffe5ee7d357838194b1cb12a3985723bb1d6849b4b3e19875c98a021afef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=railway+group+d+practice+set+book+in+bengali+pdf PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c8e302723c1503d135318caf69190c99/lefurasavegeraxarenurijuv.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160774334ac249---12345214893.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c3602db1f---zuzamawamowolikil.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/67214310667.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/kitinetoxopibizu.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/sirefebuzezaxumenenot.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6f3e4c97---45968546026.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/14421144695.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kfrtsr7s57kon4t0j6ignofoej/79826473899.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/44786511976.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb115d6007---vurufasuzoxedupazarukezex.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/57034205322.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b219938d6347f40e9273e10495c6335a/pemawulujidonipido.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/5292420249.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9512eccbb7---woreguwepemasodeg.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bumimuxipubirotuledab.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210804073836-82359195025.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc4dedfe---batozukeseso.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ba1d17c51d596c24a75f0549aedf3e79/kobefirinupokoroj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/bfa449e1369688e7bac7a0f208298b57/sufum.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/sajoromewejajanesitukusev.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/vigowosowaguduluwisetuvuk.pdfIn PDF document text
    • http://citra.cl/userfiles/file/26506141475.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/fuwox.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_off0000bf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 11372 bytes
SHA-256: ccdaaa69f6f450afc1d35ab1e26e4cc7f1d3271be14a19cea3df126e14818935
font_01_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 20340 bytes
SHA-256: 5032305dc0de8f2afdbd29bd04dfeb820f35eafde81e6df11f52d845846053b8

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