Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ea7aec9b765b24…

MALICIOUS

PDF

87.4 KB Created: 2021-08-14 16:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6400659a3672c3d3eadd4e9b003b6b48 SHA-1: 725fa363163af8b01d08f02f4f42dec21943d29a SHA-256: 68ea7aec9b765b24baa6b2a1a707dcefdff77d361ba2856af88a4cd9c10a788f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories and disposable hosting. These links likely serve as a link farm to redirect users to malicious sites, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/8fnjckjqgd3be2p8i0mnvicp6i/daxol.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/155a908a233b7396d3b1eb875d28a05a/58099812900.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080124625088---7641619530.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/413eb418fe1e4759dd30f30e26551a34/79540922912.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/98438580818.pdfIn PDF document text
    • http://immopolignano.lu/images/wexowikopawifavebenidosi.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/12107778095.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb4a94e51---topomajerajomet.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4a465fab---woxovanud.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/73904239964.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/60afd7cd040953f4f1d696ea2209fe40/19842539648.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/fafuvozebizazul.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/66862355234.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/47925436675.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f9223facb70d5c6443d21bb96ff9264/lejunisipepuga.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59d770281---sezupojujarisodipipuse.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/fumokopogogipudepud.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b8da5f68a---14120168733.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/1741351519.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/somupuxiwete.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3792807132e8cb3ecf2c2027491db3cf/50941878221.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6f827b97---88749234433.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a2110678ae5---funadesunolasonefaselojov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=causes+of+world+war+1+worksheet+answer+keyPDF link annotation
    • 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_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 10832 bytes
SHA-256: 5ce0219f62e2fb61c37ca86383bdc8429c54a546ee8ed3d434dd68d4879ee3a7
font_01_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12329 17088 bytes
SHA-256: 44383d8305e3f02c6ad1ae486ac7e9a55a44a120f661d06e5b8f56a8af5ae370