Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bbbd45596f4277…

MALICIOUS

PDF

85.9 KB Created: 2021-07-03 00:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9688e946bc4dcc979e24b84812b55971 SHA-1: 5f11125c4c762b60d4484e1133baf5f05861e4c7 SHA-256: 54bbbd45596f4277e9eb5bc60ab2bd518046da6283afe90d05ac6116b4689efb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites using the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ab19ac2b---gedijupazaxu.pdf
    • http://soflocops.net/clients/81266/File/48068654448.pdf
    • http://etnorom.hu/pictures/xedepum.pdf
    • http://vdtonline.vn/static/uploads/editor/files/39171848646.pdf
    • http://n2nlah.org/UserFiles/file/94177478393.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6d818c087---jevinefajejebusixim.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e826fc0431---kowibupixoli.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4aaa6bed9---girura.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/66d68c7aaaa424f1d68d1ad668187817/63972733957.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e04bf919---43194932094.pdf
    • https://olterus.net/contents//files/83350565845.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd09b744fd0---zupojaf.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176b4e1300---zejewirininopi.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea56d1ce99c6c7684afce484c776026b/tudunexisujasipemi.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d76428fdb2bd6842a60da7aef80238a5/setez.pdf
    • http://vzwsportenmuziek.com/content_docs/81893407836.pdf
    • http://appletechsolutions.com/userfiles/file/44299706135.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078a71d10f7b---sisilosofodu.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160713ec361e20---wuwelonesuredoru.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1f8a78693bf4b2f873e4205573f7a582/72148631065.pdf
    • http://atthaya.com/file_media/file_image/file/12725528786.pdf
    • http://alhouti.com/userfiles/file/mapikomepifi.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32b2dc02de6752fefa06ad8c52c712a0/fimomizoluluninav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=short+blonde+balayage+with+dark+roots
    • 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_off0000ec50.bin
146654d9c1672b71c52623e6c9a7b13f9ed552340ea9b06b92cd50dfabb0a18d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16472 bytes
font_01_sfnt_off00011718.bin
ce0d3744b96f72d439eca0c4f314fa7fafffcfb99bdaef6fa9d96ebe2e48eec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 11032 bytes
font_02_sfnt_off0001308c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 16792 bytes