Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc33b5e654c68bf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 10:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35de1269d55d253b263b9b01f1980484 SHA-1: 3ebbfab5eb132b3e3d5c2d595e6aa9b714ff97d1 SHA-256: bfc33b5e654c68bf5031505460f8ad65cc666313495fe9321628bf8d89ebfb82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate it's likely delivered as a spearphishing attachment, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aaronandanthony.com/userfiles/files/wenafaje.pdf
    • http://cherryontop.pl/upload/fotki/file/fopukifezili.pdf
    • https://readandenjoy.ae/userfiles/files/50982448562.pdf
    • http://shipsupply.ru/userfiles/files/14372733133.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210621013750138.pdf
    • http://maihome.hu/admin1/file/37876444075.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9e5e074---89428900136.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c31a23946bfb36caa5e4c456bc85a010/72843045921.pdf
    • http://promador.pl/userfiles/file/47933131899.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc130386c---69443641310.pdf
    • https://tonmathunglan.vn/upload/files/bixikuluzonezexuk.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d911b642e7---kunegoragekerituseta.pdf
    • https://superchills.com/userfiles/file/57706298855.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/694f08e10a870e97b3d8831d889b7a15/toviretevarobigivugurasak.pdf
    • https://tyko.pl/userfiles/file/67949169524.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/35smt2v7e9rone3l84tobs096k/nigekivemaretazadek.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/37kfii5buec2ar9esdgsnqdngu/27156059744.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fc3e8fa8---fumagifusigusonamode.pdf
    • http://placc.info/up_image/81736712989.pdf
    • https://mkontakt.pl/dat//file/56835533224.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/78948775129.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c19e1fcd998---34418123169.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=king+fishers+show
    • 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_off0000d3eb.bin
c22e2f9452590b8528c9a063c89e14b1c73ac031e1a1995b4d7a566d83dee23b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 16792 bytes
font_01_sfnt_off0000ff3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 16792 bytes
font_02_sfnt_off00011754.bin
e490300b61c1d3482e1b746dbf0a29b284441392b8c98e1d4a0861ac6538ae9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 10264 bytes