Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e22872a7689cae…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 08:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b49fa036f5d40db6b209f5374b635b41 SHA-1: 310aa4b332f9494aafd7f91dd2b1121c898b1e75 SHA-256: f5e22872a7689cae94b1c40562a09486fb752e5d1d374e40ba7b765fd1129c29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/72bee613b8dd68091c37d88a7a8d14c9/riwano.pdf
    • http://asbu.net/uploads/FCK_files/file/lunitosojunatibojinonuj.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbab610845---mepipovixarijedusuwagigil.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ug4qbh50gu7jcjv0u062m71ds0/28297182708.pdf
    • http://gayaarchi.com/userfiles/file/20210528145752.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/89105620268.pdf
    • https://bravo-hk.com/userfiles/file/dugifotazi.pdf
    • http://nedirajtebosnu.net/userfiles/file/kadokapevelodar.pdf
    • https://perfecthospitals.org/FCKeditor/file/xowuguxodalelofum.pdf
    • http://jnnycc.org/userfiles/file/vupevavidijokenujazezifix.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/660089be8e8b19349aaa40e107a04f68/zubapanetewo.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/hu1avkbjs499jafn1jlqff68oe/20562711745.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089426b75c45---24188130924.pdf
    • https://rimsball.com/ckfinder/userfiles/files/vunexopisoxuvelefa.pdf
    • http://tomaszskiba.com/userfiles/file/39325357064.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qdmvv8v2v12mtvn0562oijgtv5/toxukaxaxonafiv.pdf
    • https://muratay.nl/userfiles/file/19320790022.pdf
    • http://mynigaoe.com/upload/file/20210510035706.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757c9eeea7e---supudexufatujinisur.pdf
    • https://liniagdanskzydowo.pl/files/79251642437.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f03aa60e98a1da71988b054c514a016b/vizixijopekipopivenobas.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/gumetedenisejaxof.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4c5da8870389edde595f02e99e407d78/10791584012.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+ph+value+of+milk+of+magnesia
    • 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_off0000e954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 16792 bytes
font_01_sfnt_off00010166.bin
6a37dbf5bcdf102c4aa6d4bef78a9e81fd710c664897e549a3b4fc0df68eb046
pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 17400 bytes
font_02_sfnt_off00012f76.bin
e41efe3fe7e069238fc3707f71fa87d6d5d9a557282a12529093fbe3880f8618
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10956 bytes