Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd98e128dfb650ae…

MALICIOUS

PDF

74.4 KB Created: 2021-07-15 12:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c052d1db0ea246dbda8ece924853d85 SHA-1: ae833750dbc7c0d2932c5515b9823a3793e50ca9 SHA-256: fd98e128dfb650ae2a4a04ec45f98b35fa2f195669b2fdfc79a8329dfd666ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://laborke.ru/uplcv?utm_term=example+of+finite+and+infinite+geometric+sequence
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35cd926ef5---gifelego.pdf
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/kenovolozid.pdf
    • https://daaeportrett.no/upload/file/60327714811.pdf
    • http://clear-es.net/yamituki-n/uploads/files/kejovugofiduzevova.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ee87eb4d2d8---kapisamalaparejo.pdf
    • http://alituncer.com/userfiles/file/dumawu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4228778bb58473b07a6118acae855303/bidoxogopidagezu.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68651b81e0---32977126639.pdf
    • https://unosms.us/userfiles/file/72065404229.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd0d2429e---zumalum.pdf
    • http://alphasigmaoverseas.com/userfiles/file/59238487566.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e9039605---megubanuxiregi.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/324941a20afc69d5482ed8b26500304c/57865767021.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bdff32c6---40984560975.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86159bfd08---pugufud.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a185889c9---xupivinadufiboxovetu.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/1d0hki2iejq4j529d2vubqdkrr/tuzoxanadu.pdf
    • http://kristenpell.com/userfiles/files/logikokurafezurub.pdf
    • http://fouladsazanco.com/Upload/file/23714176207.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9maggj6oi030pgv18m66c5v2cc/vadowi.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kefotufogizebewuvodu.pdf
    • http://nbnjl.com/userfiles/files/wemuzusurerexure.pdf
    • http://meble-tk.pl/userfiles/file/60101196221.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/74805427388.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/40b34c7a2edfc7d618f6aa5cd7cff7a1/51109955053.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/83c6ac8f14c5188ff59adb7f359a56fe/lawibusedunolivisedug.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_off0000c052.bin
967789d94dee9f50a4e3ebac0187f17bcc376540f0d4813e42001099083bc18d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 15956 bytes
font_01_sfnt_off0000e9ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16792 bytes
font_02_sfnt_off000101e1.bin
0b4c68258d1f822eab5807e1b61b761b5fd2ffd21d7fa7fa95c88360597d3c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 11292 bytes