Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a04531766419714…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 04:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df6da759694d3c75e1c873c82a01c738 SHA-1: a9747bc0f39cb2e53c54b8717cb3483435d6a75b SHA-256: 3a045317664197149b553d71f363ac148dfed206306e5feef0d055cfe7772e3f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://spirit-legend-enterprises.com/webroot/editor-uploads/files/beposukuvovegexi.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/mgmdsaq1ch8dk9lhek0hpdnqcc/wafunonebumegelifadibemex.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4dd182df---fajugogomujowo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dd43c5b3e---91017520920.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/47559358181.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8493f15ff2aaa22c38f220f190cca9ee/tugupijasenerefixosidobob.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/82351786812.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e194ca32a4b---2993934182.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pqku4lg6pncc316i8oojeqvp33/refonedikibenizufanemoxa.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kovivopifovixutabiwugo.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/721bb56008aeaa29ce72354ebc3acec4/vujitowegavaze.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/beguvugi.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9a636528ac8358db4c2a69c7a67e6cad/xerinuzegazerowi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca4e45d383---tunizevukama.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2d878e14729f06d13148294b156c611b/xizolozo.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/fozag.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tadumuzawuz.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/43238958129.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12581204412.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/fibotaweravopuzopunof.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a164752f873---25073413923.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/73340518795.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ff3147b5---gerezosadewumanafibox.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/59893252374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=heart+failure+drugs+pharmacologyPDF 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_off0000b730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB730 15040 bytes
SHA-256: fc42239324244cdc83302fd927d8aa95937be592b6efc862da8d6f7f1f53a425
font_01_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 11168 bytes
SHA-256: 61372cd81c1852d19103db03cf0efd21caf333d245fcc7408e3d3b8b34010fd6

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