Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba63eecf797b52d3…

MALICIOUS

PDF

93.1 KB Created: 2021-08-02 02:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 97c1c2493973806bb62553b43b4cbb21 SHA-1: 3b69e6de8b7abe4ed7e0003d359ade4e22e13d28 SHA-256: ba63eecf797b52d3ec23331d381fc5ba5d62ad707c412c6ae6913fbf1a1a9262
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 0.9980

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 https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/79eeddbb2f1796a282f3df790a901a96/21921635356.pdf In PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/lusezitugoxeval.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/towatowinekebudaxiwafovu.pdfIn PDF document text
    • http://jar-ted.pl/file/wizirolawuruxepudofisaj.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/d83bc188395ec0fca426395c342b58ce/98821230130.pdfIn PDF document text
    • https://digireg.cn/upload/32949933113.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9c9458c1745e7a7cc53af5cce0ae2f5/90548035664.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc11c6eb406414af52c5bf6c11bf0cd/xomukewamoxuzuserawod.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905b9b70c3---21262161593.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/buxibogezominupevabikef.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/49753972238.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a296ccd85a---51972252719.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/eb240142f985d5105aa9b7959c51465c/vuzexamidarazarudeg.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/38025266518.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160baf31110924---kurufejexitabure.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4694d3eea0---57831295105.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6b75dac80c64d9672cadd9555607fbab/tazogawevusovomufizinat.pdfIn PDF document text
    • http://blatt-gruen.ch/files/46112411016.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/rukemikuzabideselupa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ad5aaad7---dewozevokiji.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9a91e8a00a3023fa4cf41ace93c54d49/96570143111.pdfIn PDF document text
    • http://canvangdientu.com/images/file/dipiriferiz.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lojojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=one+step+equations+worksheet+multiplication+and+divisionPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2233ae7f21ad3d06b0fd682cdc5dacc5/4872362910.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 11296 bytes
SHA-256: 5d2bad8fe02503f0e51e64595093504d8e49ce02fcf2a1c077e10edbf0cf7398
font_03_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 17188 bytes
SHA-256: 3e3526aa93b6a5d51dc2fb0c268f60e301e95fad7c86b33dddb9427a347badd7

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