Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfffd67ac1883f92…

MALICIOUS

PDF

77.2 KB Created: 2021-07-13 18:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84bfcf9f415031fb9da6cc15b931898c SHA-1: 892434aa35b5e0f38f450a3741b88b131cb28438 SHA-256: dfffd67ac1883f924a5f8d980715c4d23efcb6e1cb6e0f3e40c534746cc37c1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=wildest+dreams+chords+taylor+swift
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g2chh2q8r4ns1c23ql0dd4umb6/fovegugajupokivugekizet.pdf
    • http://pazzo.jp/js/upload/files/34408539776.pdf
    • https://iohrp.org/f_files/files/pusabamevelasofosuwanege.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d298a633de2f3017e18b7ad18fdf2966/durixox.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d683bfc39be54b7457afd3df52ebae6/53369394055.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/138530359b45e5299bbe27a9765014dd/zawolakepanowivutapisur.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1951991733cd1ad33e10ec41a713ee29/kaxipu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9944545fd291073781919a7700f58031/45553557628.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/muvesorovewupitosi.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9795281d3c---vikazatu.pdf
    • http://mobitransjogja.com/files/17637727124.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/55b4ed21416774f4bba4c3c5b494d185/maranibibizas.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67703244961.pdf
    • http://przedszkolenisko.pl/userfiles/file/62149271970.pdf
    • http://bogelaipigeon.com/upload/file/31170538180.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160946898cd36e---20324559783.pdf
    • https://airbays.com/userfiles/file/xilefazofoxerar.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/48835150132.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6fdc7467---42577720391.pdf
    • https://alnahamgroup.com/userfiles/file/47426342952.pdf
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/wajunus.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd23ae2d345---67083333972.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a74ba2533---relomokegux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca42.bin
54bbd1e87d090e9417e53ebe7d156aa2095daba7286049c94d6bce695c34f4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 10832 bytes
font_01_sfnt_off0000e349.bin
eb15d02a88bf5d75682d703ed737594a1d8d276a1144a6a5d8e22ce4fb67dc94
pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 16392 bytes
font_02_sfnt_off00010dff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 16792 bytes