Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e2b6812743e4d0…

MALICIOUS

PDF

101.5 KB Created: 2021-08-10 02:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40a2c962311f5f468696909ea9de87b9 SHA-1: d9e18a5de6284073959eb4c73c69bead2fb8a3fb SHA-256: c2e2b6812743e4d06c57b2b54f507a6202870146399d0fb09b8d1be9f2199567
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to exploit kits or further malicious content. The presence of multiple links to compromised CMS upload directories points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0453aab6a2501db58c766eba66121400/bevogi.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/688c5954dc1aa94b590663fe50e58512/32220535115.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/55834075044.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d0bd1de48115048ff7301028c824d600/gifisejesusixene.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c598fd3dd5019e4ef93ce143f333e567/towevamofavugesefalos.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/uadi0q5qonnj64cievtlhk33n7/41733456170.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/sufuxebajeragota.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/bijodiboxowovel.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/nigogivusoru.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/74014765026.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc37fe7ba3---41528646324.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/52614553503.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624075fb67---47513735153.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/pawox.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9a62aa69---4428845164.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084676ee7a56---puvokakugig.pdfIn PDF document text
    • http://merwepizza.com/upload/file/1200348356.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/25609675767.pdfIn PDF document text
    • http://renovator.cz/files/file/92484067896.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d44f058353547d6c975db64d0d4e7ffe/17783274273.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/23486868446.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/13514940016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+a+thrush+turbo+muffler+sound+likePDF 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_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 10944 bytes
SHA-256: 6e96dcefb833ce3ba71bf17394d6aa243bde324f4313b4710116491214ac9410
font_01_sfnt_off000140ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EA 17604 bytes
SHA-256: f605d56dbd2d519cb42a7dedfd0af416979606081dbb8e9db231d64ac6739bde
font_02_sfnt_off00016f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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