Malicious PDF — malware analysis report

Static analysis result for SHA-256 3851e47868cf7a5d…

MALICIOUS

PDF

86.2 KB Created: 2021-10-12 20:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 842bad216b7ba08d8bc8a5759de28b1c SHA-1: 011296fa95dc29d9d1cf70bfd6fdcd115d8cc799 SHA-256: 3851e47868cf7a5def68613aefcf2aced77db167e9dbc6c5f6eefc4b6db02aaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several URLs extracted from the document point to potentially compromised websites or link farms, indicating a possible phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.cavice.fi/tiedostot/files/6260333801.pdf In PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotelutabuxila.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/nozamizevosiperajopanom.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/sevakoboxujamixukemegise.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/vadutuxavakes.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/4odf9p0p430fml9j13lq5oe47h/gedagutumivumonulitoru.pdfIn PDF document text
    • http://weldingplaza.com/files/file/zupibiletuxodozusanup.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/63858389196.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/gufazikalugagese.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/83777309457.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/fajodigomano.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/retugoxosogiru.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/janenox.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5badc3401600f22100f3f1338dbac1a5/70256327496.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161583889e7d09---boxesasewimawaku.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/51763701379.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/14763118653.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/87382455776.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/puruluvotumixowu.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/52120811611.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/musipeb.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/ginavewawomemuzazijiwo.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/80466623966.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/fdff0dae948521d5e4125000659e49d6/wujevaviziginusuwavafoda.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=how+to+get+rid+of+markup+area+in+wordPDF 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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 19632 bytes
SHA-256: c015141a17b90e90641af42441137dcbdeba3fa5b664b6651fb28e436758f910
font_01_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 10896 bytes
SHA-256: ab36b52eaa912bce08364efd7d49e2a436fbb459a91e0c9a441b134438f164d2
font_02_sfnt_off0001328e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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