Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2b24be32897b35…

MALICIOUS

PDF

76.1 KB Created: 2021-08-31 23:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89b8fc7d8c081647b51ed02a5cf0612d SHA-1: 9b49d9a6c0e26cade8653b3340145d81cd11d194 SHA-256: be2b24be32897b35392d9833614a5651885c642c201dfc51a11e6d7f315a337c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomortiga.com/contents/files/tipiwer.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0165b3842---jezubamamawilul.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0893ac0da8---47137191949.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d07795f04b---51234413350.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/xigilasafafiwakazumu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4af6fb17848d6e5bbcc40a98885831f5/xekoxomo.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/52177392894.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/46382013147.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/60a93530tfb88md0c5ma7l7ed3/74568293224.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/70617932845.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/63669174398.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2e452db11f36369fd7d6a0e67965d4b7/96081770178.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/zakujanewilevefurigoza.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/02434244703ece840ca71cb752fc2a46/75790370671.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/81764198096.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/fumakafilowifowonotoxuj.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1626355170.pdfIn PDF document text
    • http://ubest.ru/images/file/fibajazopukululed.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8bae4fc3---viwoxukaw.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-13/images/files/43702461235.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0d0293fb---47592871296.pdfIn PDF document text
    • http://wawa757.com/uploads/files/zenafubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thesis+title+in+mathematics+education+in+the+philippines+pdfPDF 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_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10848 bytes
SHA-256: aad2ad8f217f7cae8c547095a09e9509aee7d25f8e5e8ec92bf31e8e252d0beb
font_02_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16744 bytes
SHA-256: 650f8e28fc19ebf431721d205783994728c24624bd40df826a29f94a82996a68

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