Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde2bf159284c36d…

MALICIOUS

PDF

82.0 KB Created: 2021-06-06 02:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9939769000703aba63e58c13607f66c1 SHA-1: 2129298484e940f1c36ace0f39da61a48cc3df25 SHA-256: dde2bf159284c36d737b119b7b34c37d7812103ad781f5c1e496e2b528285f3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=ronco+compact+showtime+rotisserie+bbq+oven+manual
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/166dc2764e317711bf8f7e7869c153a4/perogazebagagaveg.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608825a60eb5e---mokeluruzurojojazugugu.pdf
    • http://sanphamhanquocymy.com/uploads/files/wiripidut.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce833bfc6f---levej.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1141cccea2---gesozakomedek.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l7ancpjpppfuu8apctmdg5p30c/xawufixusofilunut.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d7ca029298d35d7aeb44787abf12e286/80605232495.pdf
    • https://northcoteplaza.com/userfiles/file/58798735792.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b475aa6aa59377ada83cf7d28ada5720/daxedilalufoxifup.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0afaa7a9d---jagefodo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/03ddd44fd5ee94485818713f53779343/bedadozaxidopakifito.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9010c906e---jubumuwefefo.pdf
    • https://baobihungphu.com/media/ftp/file/rusazogojodezinimawirapug.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbdc98d253---sesizulijokajenez.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b0a6ec78515fa83b4513272add2ca402/mubikovewovu.pdf
    • http://aldara-latinoamerica.com/userfiles/file/23790076634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001032b.bin
9a33404ac1e3237d6346aa8d85f2da9bfb5d2c9e1ffae813fabc756a68674456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 5600 bytes
font_01_sfnt_off00011625.bin
9d954b3116afa13b5ab3567de9e54aba8517dbacd04b46aaed156fe77bf32799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 12528 bytes

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