Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3f5e391baf5a0d…

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 22:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c574e078cad34c59c7715cb60688379 SHA-1: 29c41a64f3633b83e1d065b50d3756c549d03199 SHA-256: 1a3f5e391baf5a0d4ce2420ed4157bb6bf94c25df1801f2a7c0b51cbc650f6a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, some hosted on compromised CMS uploads and disposable domains, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=mckamey+manor+40-page+waiver+copy+pdf PDF link annotation
    • http://zlato-invest.cz/upload/files/64101795417.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/75835059945.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccad81f2a---94424423515.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/99745760913.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/26956696693.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/34919085096.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/50815343519.pdfIn PDF document text
    • https://actor-conseil.com/files/file/92313168480.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a801edebf8a---nutilodewetekufowamoj.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/gamexakusivepajejufaw.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/sabugotanesusatot.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c186806daa9---42699258735.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jufesikowaparuti.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/46074795501.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/86978702742.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/97370023463.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed0eed68b8c3b04ad2d210b2e5d16767/19146605499.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf1e1d4eb6---mixeferevenevipezezo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/gakoviraginaworuxarogovix.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3f7cbda4d9ff5cd1758368e73d91ff7d/kafasusupujomerotiboloket.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/13408910035.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adc62dcd791---9511451824.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/nogogujulajad.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/bovumivesuvedulufoja.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161161bdc98c90---38465225322.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 11236 bytes
SHA-256: 4361839f294831e2065c5d460391c1ccf1740db62f9524c61a611723b5413912
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 17024 bytes
SHA-256: 0705b7365b5095fe239c06b999418a2c1451e5cb78508e594d88bdba00b49580
font_02_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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