Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f5d2e8a7718ed2…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 06:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41981bf485a0278a211a82b6dc9c6e01 SHA-1: eb4b0397af21a8f084dc3558b4a3e305edbba4c1 SHA-256: 53f5d2e8a7718ed212ffb0a6548c993032f7864cc2c45dfe032d78a5a4d0bf8a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or a distribution point for malware. The document functions as a link farm, containing numerous URLs that point to compromised websites, many of which are WordPress installations utilizing the FormCraft plugin. These links are likely intended to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085220ed7118---kakabu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2e26973b---xivonemumanonujokomategox.pdf
    • https://ludifrance.fr/userfiles/file/38707592488.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fa29d06219f336646ecc088996bff01f/66239167606.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee91e98d7bdd643bec06857d3c1de254/762099327.pdf
    • http://sillajen.com/fckeditor/_upload/file/28495338963.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/db548815bea62d1c82e6717c119ae05d/29274101723.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a82cc782e1c8c4f4d7a081a3730c03bd/lukuduzimidevu.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/matogelinumetuvepit.pdf
    • http://ajivikafinance.com/userfiles/file/lejamak.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e28d8999---41045866507.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/zodif.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac140f48946---luzopetipupuvoxeveni.pdf
    • https://gregor-biffiger.ch/userfiles/file/45663864294.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/nusos.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b4ff93f33e7c41754cb18c43f06475a7/rovovisojebagolokewojolo.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1ae7f6f56a79802e9f03683cc4677ebb/muzimoleseretaxu.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/cn59k3al05s4k92b0j8biotc34/sefusipib.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/sezuvitu.pdf
    • http://cnc-soustruzeni.cz/files/file/pojanalag.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b918838b8---83101295463.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1bab121ef---33175218807.pdf
    • http://dailymaytrogiang.com/userfiles/files/40777531617.pdf
    • http://3bbb.fr/ckeditor/upload/files/zuzesesabijifurojidawajis.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badac8665c6---davajinaviz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chapter+12+nervous+system+cells+worksheet+answers
    • 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_off0000ee8a.bin
62971858cf2da4e2df88b4d3fac2bb0bc73fe3e23a608abaf05812b07f231110
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 17200 bytes
font_01_sfnt_off00011b37.bin
a2ced8d4099c1cd4430cfb9fb234c21f459f6c74c6613cc27d2b76a2bc694d86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 11208 bytes
font_02_sfnt_off00013592.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 16792 bytes