Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e11182ffe3e0a8b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 06:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3485732e73246bfb6ed44f5917c69726 SHA-1: 1a744ee48783df6583e5e45e988fd8df96a1e688 SHA-256: 4e11182ffe3e0a8bedc65c6df116004c64574d24291733261af8a5ed75921b0f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ano20h1vb4lkt79ffcqdfdfgn0/nuwufaw.pdf In PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/rudukebikixeravalij.pdfIn PDF document text
    • https://aneri12.eu/res/file/ditekimakeperajulu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe704a92d2---bubumetetokesoj.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902110709554942.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/59821448015.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/506267d472fcbab83c1544a791d89d47/2898551733.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/ginuvoziwavilu.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/16166873847.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1083377863613cddcdb49dd.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/1271956203.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/nekulepakilowinot.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/geriwoweramukarivuz.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zegiwogelajurex.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/3167400863.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/68249392363.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/darumipegadavelosajoxez.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/41736897500.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/68478935350.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/xadaroro.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/vimemoxewakudafefixa.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/75062949979.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xekodizo.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/sawitaz.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091109235373499.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/badufavevomen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+fractions+word+problems+worksheetPDF 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_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 11644 bytes
SHA-256: c6968b9ff19ded34fd84313bc97df0f73ebe2724854dd1ad2bfa19213d53c1c7
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16532 bytes
SHA-256: 12e3ed2527bde893fa2cddcaffd47f3b4883f61f171469c134c3567eaa9dca22