Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb21ea3971b5176…

MALICIOUS

PDF

80.9 KB Created: 2021-07-24 12:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d068297964f798a73eb2785a0a0106f SHA-1: d1822e5b4275f5f7666fa18733dc2d62c4255d6f SHA-256: 3eb21ea3971b51769fb7fb438776046b6491b792d61d01094cf0349fc4df3350
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests the primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/95d7783f7f8b34ef419cf67bd140a921/65517006520.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a12e4df9c---vitifaguga.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097658e8da25---48910781149.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a64aa9d764fbe029d97f01fa300610b3/76030583408.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/luxenedenudarinaniboduta.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021063002430041.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/90644075723.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/33650309250.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a31dc0d8205---43771250225.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e1313f53---mugowinojedumiwisixo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6379c9676611f3646159988bdaa64d12/43834648877.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dakolalenawatiwilobagipox.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/h592qbvtod44pn8mffakpv95iu/83539295589.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nubisezazonasazi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///92179935883.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/loxogoxudilepaxijubemon.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b17210666---desikovaxirewunawupe.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/80073699103.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0edd96cacccd7041febbbe0e5d29686d/3050513410.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/8034457303.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0c13d6720bebd2ec557a68a9b64dd0af/sosazaw.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82906547019.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bede4578670---11402933238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=acrimony+full+movie+free+download+youtubePDF 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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 16148 bytes
SHA-256: 6f0d9e86b63abdad4b4e45c49d386afbab004098c334bcbee06795a08a85b819
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 10956 bytes
SHA-256: a752bbc4f1a41d84b6c981d3ba2dcf86a6cbeb2839bc1d0725b1b74e65e52878