Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25b6da86e4901ab…

MALICIOUS

PDF

83.1 KB Created: 2021-07-07 06:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c80a6ff9949cbf1207ae50f91ba9e57a SHA-1: 3d1d0db6f41b8ef2b6d505bd710ea16d4ef48535 SHA-256: b25b6da86e4901ab2b47dddcf4c9c051e39fb522c78a9d2ee5958f4c3a735892
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external, potentially malicious or compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/58876314096.pdf In PDF document text
    • http://robalton.es/Albums/images/file///34064171097.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/bavatarakudiriviwib.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16081c566af8a2---94495402362.pdfIn PDF document text
    • http://kaies.cn/upfiles/210630171047831273ofw0m0.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083a687698c4---doxolako.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9922b6a2e6---fibagojulokitovakefav.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9061fe298a1108c8bfc8e58a6e195c0a/28576974576.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/78afac0e174a8c30503a956fe95f2dbe/julebirapujuba.pdfIn PDF document text
    • https://bamor.org/userfiles/file/dizilixus.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0f8b08a2b19f2237cae1e335eab1cec3/romivadonazolowili.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/68757339727.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d3c2b65ecc5bca549fcfa5fdc779eb8a/norukegofigorap.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317cbafbde---rokuw.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/624jr2ed6cr0td5hi1fbefd5l9/57942050763.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/bafizizenexofegowug.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c80e409b19ebbe42f95f25e9cc0f9c87/xetas.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zadogebalaru.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/26330564251.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/80a2a9ce0018900993c4c67338f1ccb5/refuwubojo.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/wumelimijebawiwinil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+you+fly+in+minecraftPDF 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10760 bytes
SHA-256: 9ceb2baf70e50e2c1440a6569030173eb6e3567221daa6b91c652948626697d4
font_02_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 16720 bytes
SHA-256: 02824a7dfcfcc3ca474b9f69e678602508d0d37238023fae99f786fb08b1b401

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