Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21a5b8625f5c853…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 02:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a963b873f306db59fa0f019a3f9e9ae1 SHA-1: fd304d26aaf79f71a3ce4b6ba5617ff7de8aa118 SHA-256: d21a5b8625f5c853c4cfbb8235954e9109740e3fc4f1310fbabc11a8db91f55f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common vector for exploiting vulnerabilities or redirecting users. Heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cef66f2d---suwepom.pdf In PDF document text
    • https://akconta.com/uploads/files/617002091.pdfIn PDF document text
    • http://kim-clark.ru/files/file/28148469079.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/24987913472.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/63160943906.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/78338945158.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ca13e576b17e423407fbdb798806166/3471077243.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53924069310.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/64212604905.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/43010792176.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/06039c17d500e65462429b720287f1ee/povawasegivojexaf.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/32199063771.pdfIn PDF document text
    • http://skolky.info/foto/images/file/22274376518.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/99594445013.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/9573223880.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d8e188264---lipoguwezoxivekisavitipi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160831be43af5c---62208685980.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be87e7a610a---baneg.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/62133703732.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051806582397.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/dusedifo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f75b09a371e48025169d8fcec125eaef/25718815914.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910449090a9---87028684660.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c69cd567d---25378659468.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7a50d88b---49589783670.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vukifeluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=vedic+mathematics+multiplication+tricks+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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 11048 bytes
SHA-256: 8aa5301397c8155e9a492a22c335af5810f920f7a567d120e283b0b03543e07d
font_01_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 16496 bytes
SHA-256: 83df6e137dc659dff6acc88e5c137d22b58ab3fdad3c2e7d0a2060df31f246fa
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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