Malicious PDF — malware analysis report

Static analysis result for SHA-256 4179bb9d08bfacff…

MALICIOUS

PDF

79.6 KB Created: 2021-07-20 02:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 313fd6a9f4347286eb107ed5353e1137 SHA-1: 6374dac377fb988c48fca1d8cd375774e012b6a7 SHA-256: 4179bb9d08bfacff4e247c6a615254c93e39d474288e2def2a0ebe13c917454c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j40n1k1d1b8n858aj414ubpbl3/81547717539.pdf In PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/ruzuwowamegin.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2237128de0e9ac3aa2b82ce32cbf81d9/nufiwudowaxirepalegol.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/99219143936.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3d203c7bb68516d6797d249a1679183/dakamozif.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb85e70c7f7---20410320099.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd962ce30f---linanotopajofipap.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/dabuxiduravuguzilogor.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/44532014787.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d0ithdklki54btujjqajcf6nr2/86184461905.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/kugupotezaposidekuruwari.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i9ia3u72t08m9sr2smelif0c02/wedupopagisikexanevimum.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/31696347713.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e33287aaefa---nesegizatifaworurokewaro.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/39282677795.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e287b448793---piwifesokerigemuto.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607071e0a466b---vuzifanarimasumaregamus.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/regisezenav.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16095904ecef57---xikarobaxekipo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160753a4aab8b4---85448106962.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/be8b66b7bd9e47bf7e820e5f07719d52/74952935318.pdfIn PDF document text
    • http://ore-processing.ru/d/files/regozafevilax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=moving+averages+101+second+edition+pdfPDF 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_off0000be50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE50 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10980 bytes
SHA-256: 9123147f3cfb7f42e8ac5ab84fb68511f813b00e3255ed57c7818201e2235391
font_02_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 15884 bytes
SHA-256: 7bc975d1b3bf5408eeaa43347984e452d7f45596a1cd57d867de9870b0aff8bd

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