Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd5af9dfa40c951…

MALICIOUS

PDF

77.5 KB Created: 2021-06-18 22:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c874a734b3d8b6c2902a307d9c6687c SHA-1: a82cb7e22a777f63715b6cd41955c6689e9a3d6b SHA-256: 9dd5af9dfa40c9515f71391b6f723efaee41df4d663e0bb4134fb8483c6a21c4
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of these links and the overall structure strongly suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/uqq43fmrjcmimjaajsjkkjee34/gokitakusederu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0c0553df8c47a69e02588c93d4bf5adc/77125306938.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7ggf12va4a49or1pchadpl320r/mikimabedu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97cf593a7508db690579ae9aa9c18b6e/fomugetojem.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084c63f7c4b0---76246787250.pdf
    • http://alnoorcity.com/userfiles/file/90111595025.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/83249275603.pdf
    • http://aeronautike.com/userfiles/file/sibaboletuzufetirosil.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/03epc34362gffp6eejc8mqg6pk/dunikugefufuvinariwogeje.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tajuniroduzitij.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9b6494e693e6c38bc4d6abf2a5fd5f1e/varijukawanaposetuwodigoz.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/684bed54f25fb02f5eda2300b9cac261/segazelarezol.pdf
    • https://seeandhearbetter.ie/img/shop//contents/zanotojuxanabalomufa.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a529f03476d26b677856211882b70524/xubadalikofonok.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695c1337f6---sajezuzara.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/boi32po1oqgeg5jifh8oikb6c3/lavikawuj.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b493c963cc8---17065631702.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=grade+3+division+questions
    • 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://scripts.sil.org/OFL
    • 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_off0000de12.bin
8fd17f2c62c989aac236ffe5509c9565b217ab36fab3014173d8e889592485a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5168 bytes
font_01_sfnt_off0000efb9.bin
71f5526c34bfe5c83f3717bed052f1bad2a7f8a07bc626000b5020c824b95e55
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 10544 bytes
font_02_sfnt_off000113d4.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16204 bytes