Malicious PDF — malware analysis report

Static analysis result for SHA-256 a706757a3b83af9a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 20:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37f07263349c0359e3f07ee0457cc62e SHA-1: 1b35c580b9571ace0e66c60d2839f38f976c1642 SHA-256: a706757a3b83af9af9eea2edc0464127c9ec0f65d5c17d58dc3d8b07baaec542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=clary+calm+doterra+pdf+italiano
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa53d93350---70493999433.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4fbc96afd---nisad.pdf
    • https://thingstodobahrain.net/ckfinder/userfiles/files/vexasex.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2e7dc5eb8c3ab059d35455c1ef5a3e74/24687567956.pdf
    • http://kleinschaden.expert/userfiles/file/busubenof.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a4c66596b074ea29c589f037d8eb58c4/nutesuxowuxir.pdf
    • http://resheto.ru/users_images//fck/file/numitezepapegexox.pdf
    • http://sharon-barron.com/userfiles/files/dafexupagekunadu.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16129092682bf7---dejivagokejidojijesududi.pdf
    • http://iccarrentals.com/files/file/7996866537.pdf
    • http://sarlampa.ru/upload_picture/beposakidugunepifozi.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/mewozisi.pdf
    • http://www.deopendeur.org/imgUser/file/zoninonalijumila.pdf
    • https://aldapa.eus/files/galeria/files/dinogakutuzedofilajelup.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba86a17a22---14054955959.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/lowudavigewed.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/tiwatav.pdf
    • https://pichsas.com/file/21766129618.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u6a86a3aabhrnrtl515gujv122/5631607068.pdf
    • http://studiocinti.eu/userfiles/files/62532141610.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5232c00f0---18670934405.pdf
    • http://licausi.it/userfiles/files/rebekijowevumen.pdf
    • http://assushop.com/userfiles/assushop.com/file/wenibojabesimu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc403f272d---94802586957.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_off0000dbfc.bin
2a4d15d1f919a0299865c069fac940ecb2959b0095efe0c752449c35a3edb468
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 17068 bytes
font_01_sfnt_off00010821.bin
ad9c50085436a7ecfae456da58b946c070432a6f509f775af470bab5c4d7f390
pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10756 bytes
font_02_sfnt_off000120e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 16792 bytes