Malicious PDF — malware analysis report

Static analysis result for SHA-256 233e1683aef7135f…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 15:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e932413a5a84bdfbebf1511f3c05878e SHA-1: 472ce8952d9e7ae82a499ba2b4369f6d48b4dbc4 SHA-256: 233e1683aef7135fb114a43d99ecf7ccaccf7c92ecf27c98fb78208128e9061c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content or engage in SEO poisoning. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce35744b3a2---35582290317.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ed2a47575---terafupadobirajuk.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/23960822198.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ba60a4ee772d645fe8ba6b9a2c8dfbca/fanifex.pdf
    • https://gachbinhduong.com/upload/file/7687929286.pdf
    • http://driver-jazda.pl/upload/file/43418368150.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c13ab3144672dee8e0bed18879a6ae31/23859867550.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/42161195732.pdf
    • http://gurukripapublicschool.com/userfiles/file/xasisa.pdf
    • http://akkoryazilim.com/userfiles/file/22678930205.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f99a5c909---58060090142.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871ccc5956d---65459842987.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088979bd519e---telifetazevijimuvedufovej.pdf
    • http://doks-films.com/pcms/content/file/tavukofufu.pdf
    • http://cooperclassof1970.com/clients/9656/File/3197284480.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/xobogipulep.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/27153131510.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c37713ee6b---bikebobo.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9cf197d1---29712712764.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ccfc7f3f6813ec570f0fe60c5aac0baf/kivogabitow.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/lofasizabetaputomage.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/xoxogujamoxolu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/84cdbvhte91hei30g10blvfpum/65118240347.pdf
    • https://secolink.sk/userfiles/file/mopom.pdf
    • https://semut73.com/contents//files/76349193618.pdf
    • http://suleymanporoy.com/img/userfiles/files/96174884575.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nokur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+you+get+auto+clicker+on+cookie+clicker
    • 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_off0000f361.bin
88346a0b410c1005a27b11dfcbf7fefd9e2ff97292ecfaec2a370203fe7b5207
pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 17480 bytes
font_01_sfnt_off00012113.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 16792 bytes
font_02_sfnt_off0001392a.bin
2fcc297f68e8ad026e2b97d167bcd9c6d0e61fd7690a9f3289f90414633415c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 10760 bytes