Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9677befa727fd52…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 17:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 18a9e5b772d12be5d18a09a185e8ce81 SHA-1: 65eb4838219c30a8b449d90ccd2764ebaf5cd019 SHA-256: b9677befa727fd5275f60145042b48d3d6d8299e04f6ef6d31382888ce00c582
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bajajsports.com/userfiles/file/gidejebitiwip.pdf In PDF document text
    • https://securitydm.eu/slicice/file/todusa.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b8b02b144---duselejorokeful.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakaxuxefiwovemivamize.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/fudoxopile.pdfIn PDF document text
    • http://asfalon.com/__files/file/riravoluwutafuwibumija.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/3427827147.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///fasaw.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/zojabexojaza.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/94291360674.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/ximenikefegatin.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/df6f5e455adcef51424af0e78ced20a9/rifan.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/82877161068.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/99111333494.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4626a2f456267a4dfd5f29daa0ab9300/12755626504.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/vorexofuvu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/5287744371.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/2605751188.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5fbc7a5e---38408413199.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/lha78eoock7085frec0ofbcfuo/warugawolipilaze.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/76974189010.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/2693779044.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/7701668309.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72e1456cce---79431688681.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3256a7ebf4a25b791713ae33a30d661b/nifagugubedenutewaf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fulipijetivigififizerabal.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/texogobipejaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=spanish+ser+o+estar+worksheetPDF 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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10556 bytes
SHA-256: 4ce90c45502a1d27bea0a2a0fcebf64332e013da5bdfd84e507da32bd31fd224
font_02_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 19128 bytes
SHA-256: 3d008580a764c77be8b27772aedfa3c38a619beedf8f6ec014f28fdf49490322