Malicious PDF — malware analysis report

Static analysis result for SHA-256 259426f6ac106240…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 18:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dabb32d0f73f40afa597419f7df78269 SHA-1: 47677e2a2ddb61ad97e2e7987c503869688691a0 SHA-256: 259426f6ac1062409af8cf80cfdeb45c574dafcbe9ec03ffa83794258ea4ebe1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hrmconsulting.biz/upload/files/musewatuvarotopuxi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada3e7f4fb---xotetivezodovuganixidiwom.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0cb766f8b546d3e8c05b9e551891c5e1/33858889989.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/levexapojagetufufiretiwev.pdf
    • http://www.dismaplant.com/ckfinder/userfiles/files/46658271813.pdf
    • http://albarossa.jp/js/upload/files/vexufejakokikevatodufivi.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/sakune.pdf
    • http://irinaburmistrova.ru/files/89233158549.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/832cec919718d42d765bf2d312579c2d/gawepatojunetefuxajubejo.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634b3acd6c---gawoja.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/569371378f53d6060587f1e7f7fbe384/26413512895.pdf
    • http://banlinhkienlaptop.com/userfiles/file/44972304360.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f659269f8---vopogepir.pdf
    • http://fittbikese.hu/files/file/48776939128.pdf
    • http://ippinnudon.com/uploads/files/94352695155.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4c841533---zejujuvupike.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60a414f83---82022013223.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hgfromuin0jctt2opble95fgra/19275585223.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ht5bo0mu02hk5r9rhmdgd423qq/59729826018.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/i7clc8gl3sj53t6gmfi3m97un1/lulisuzaworitoxaluremusi.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de620e13---mawum.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57220ad2b---nipezasozimidutazujes.pdf
    • http://chokmanee.com/userfiles/file/levetutenemuretit.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/67ea03ce18f6375ccfaaf1835f423607/liwedulejikomi.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098bee6a94f1---sofamovilozejagolegu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/432a0bf971ffab1caf4260d4d0929cd5/modis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=live+score+today
    • 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_off00010972.bin
19c1b6ffb6a84e7ebe7c2c41539f246459b1ca19ab228d41931d6b431f9bbb0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 10352 bytes
font_01_sfnt_off00012103.bin
3e8f0df44bf07b9d0ff35b9251d57fd65fcbe0a2971f478b4ea5360d35efd964
pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 17128 bytes
font_02_sfnt_off00014d75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D75 16792 bytes