Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f26e816ca266f95…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 06:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a5ecb300b0d17ad69fe5ea20bb8c73f SHA-1: c9205b2d1f6c524b8fe2cd2ceca226d4232f6045 SHA-256: 8f26e816ca266f95fcc040197cca895edeffedeac4dbbcbcf0554aecaf848ca0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, with several pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://bandotrading.com/uploads/file/44833018292.pdf In PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/xujutupa.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/buzujusekole.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/51581748036.pdfIn PDF document text
    • https://rais.bg/uploads/file/kitozoxibijalu.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lijodutokuwekar.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939b3edd26---fitejukutaladukeziti.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kupazipafez.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/kalikimudulukade.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/fipumukuzenilotapog.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/rerebabeselozigibadolej.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3401c066b8c52df78e66e06037e4785f/rulemafasozos.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c47fc6358fac074ca0f4a82c932e2590/jasop.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/banejemu.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/wexetibojesizixize.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/sujodulipigedelupidujaj.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zisubidibomigarowope.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/gupabilagisuto.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0c3e6a087494125e69343d10e1ce8b72/dezasu.pdfIn PDF document text
    • https://agrando.cz/files/file/vepasalolusagixefejove.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/20742386652.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xerijuzegevete.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3d179ff9---melire.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300df2511df---90152170002.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/38380312212.pdfIn PDF document text
    • http://15881588.com/ckupload/files/bugiguriwuxikajuxokegede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=democracy+in+america+george+lawrence+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 16900 bytes
SHA-256: 2a010a345c95e5142cfea753d28c0bcfe5ffff695f502755f2d6307d5a5eb441
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10900 bytes
SHA-256: 5ca65e3b80800a983fe528b76f8c5569b3c0518ac3d25b0c334f212abf72d7c2
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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