Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10750916b9ee804…

MALICIOUS

PDF

92.9 KB Created: 2021-09-11 15:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8901bbc263fafe7d3a832621401ada18 SHA-1: 6b4e67a9ff953b8b7dcb1f1763b5c07020e7e7cc SHA-256: a10750916b9ee80435ca676be403e7e637ced9b385df3f4a45141f7bf7bcff21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=movies+like+now+you+see+me PDF link annotation
    • http://mtt-association.fr/upload/file/ridoxigudefesuzapuwiperig.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/sibitewegiwoxipejesodura.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ronefulim.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/acb7feaaf418088b2094518143073fa9/gokeweraxol.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/gewegozibefunilu.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/20787169028.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/rotexiwalolu.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/6042413538.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dc227b5b1---45584459067.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/27640307853.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/vazaxixedinupobamive.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36594941905.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/56805301289.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/5344529150.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/niranedoxajojimoxepivag.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/scjuuk1pdr8g5oilmjvsj28ga2/24447142878.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/sotadiv.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/61157379544.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/48029764663.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/35673518112.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/51275898973.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/6938182798.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/86638544696.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/63543014083.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/umtkr3tfashq1lbbg5c50e7nn1/kivelawovir.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_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 10360 bytes
SHA-256: bc596dce25f3d4e26529cb95cb444e473bd3d4e3056bab215c226bbe7942f07a
font_01_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 18164 bytes
SHA-256: e6f0d40041f7410a8df19621f2bf042d2f6abe4a52c3dd7cf21d7fef210afb39
font_02_sfnt_off00014dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1