Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc24032eaa1ddbb…

MALICIOUS

PDF

104.5 KB Created: 2021-07-01 20:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd38f4118aa683438dc91f49af8d3d98 SHA-1: 773df35f66a2cb38a33a1a2418173bfcac7c668f SHA-256: 3dc24032eaa1ddbbf33418f6f54d546de60a93522a042899960f835c2bc50008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://crysiq.ru/uplcv?utm_term=land+that+is+surrounded+by+water+on+three+sides
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/da8c8d8c5e561a5e2f033e864a999b34/weligesubozodupenel.pdf
    • http://solemarservizi.it/userfiles/files/voridetutubunulit.pdf
    • http://automotiveenergy.cz/userfiles/file/mezawuzoj.pdf
    • http://allnatureint.com/userfiles/file/60328531091.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0c36e56ff860e7d715fe309efef91bf3/vuturivexudo.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160992c53f135c---pimewagalu.pdf
    • https://ajitcoatings.com/uploads/53701231300.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5355a455a2---85048848605.pdf
    • https://maturana.cl/upload/file/562877125.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e03991914---61497484623.pdf
    • http://www.tomasjelinek.com/img/pub/file/12720370961.pdf
    • http://cathugo.de/res/wysiwyg/file/wixujiwugapani.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16225838416445.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/cd2d022f787e1a8736cc157a7aa625df/lobepizemubevodadosa.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/691993328215daa502b9fafa5a35320c/30891517505.pdf
    • http://ecovn.vn/uploads/news_file/xezipukimutewilipa.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8d3d09a137b0ffe7676e2b73a20f88b3/xegirigavamebubipag.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb8b32d719---sujakenaseju.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/updtjq97l5o4pujcs5ljtn8rh5/xagox.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedda1aafa2---taperoloravun.pdf
    • https://szabobuszrendeles.hu/files/files/61362442492.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p98pvgagrv87m01eo4v6rkorj2/19974197898.pdf
    • http://planetamama.ru/files/file/90227800988.pdf
    • http://fullx.net/files/vaseza.pdf
    • 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_off00013234.bin
dece1425163f5f954ff406854ffa0870656692584563d77a2ea8c9567d2ea232
pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 10696 bytes
font_01_sfnt_off00014ab6.bin
5399916bcafed70e24f1a3f568ea331763d69b6b2ffa69b07b60c490d464258c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB6 19304 bytes
font_02_sfnt_off00017c65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C65 16792 bytes