Malicious PDF — malware analysis report

Static analysis result for SHA-256 3593ec0ab1ae8e7e…

MALICIOUS

PDF

81.9 KB Created: 2021-07-02 11:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1c329270dd5782235813fa0d0cf1bfc SHA-1: 22d1097c73aaa04d1b96da127adf073e43b6f9f3 SHA-256: 3593ec0ab1ae8e7e33cf94cc652fc0b424414a78428e8a7001b6ca5efed1a805
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=which+of+the+following+is+a+main+difference+between+prokaryotic+and+eukaryotic+cells PDF link annotation
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74a3120bd---64129349495.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f50b1250---guxitisiruloladus.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/r9di76o8j9ua37iljs379djr7p/44667381374.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2tikfmv1cdv6s3g40n8q95mq99/vagokexojebijiduxozo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c61a8ecf---39434085944.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/pemikarukowe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79a4f2b7f---mawupu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/32742721353.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/98506068824.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34858b62---37777597838.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a65184f54f68e574a4d87ed2c4e396cb/95901199191.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/fifonen.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9da8085a9e33ffa21ca0878bb14f6321/88841157540.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/56157929326.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088463f667a8---lajasuxanap.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nanubuwemazagowe.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a858ff1326c---97621658950.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vulen.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/npq37f3qmbae57mo8mi53190t6/62035021914.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/virezadagonine.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b47b3c1f0eeb534c5889b4c45c557625/tedokikofimefafizilo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/acksnqicsb3gm541a815p4r8g7/wugit.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0h9k3qmuc2bjtrsjsv6tj4i8ro/dadorozasosire.pdfIn PDF document text
    • 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 11592 bytes
SHA-256: fe29373e6d04485f2e04ceb9d529b8ce6c818a7d3f575f0d83aa3d17d8b9cc32
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 17076 bytes
SHA-256: 83b260d7086e66d8cb720fa2e86ff34f7cfb10ccb52ae3afe58f35aab7d6f7e9

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