Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76a96df2f52f2c7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 02:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bebe1a04f03c27d17c50bfa6628fcd7 SHA-1: b3d7e7629995c9b63ca4da73984b5b22b75b685a SHA-256: c76a96df2f52f2c7d05448de2950430db0a4a7dac4a9e8fa651a730ea940bbeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158c661575---vojigixetosetofusexo.pdf In PDF document text
    • http://pillshop.ru/uimg/files/juvowizojozaz.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/76048961345.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/37488808949.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf89846946---37624106980.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/9888246078.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tejowew.pdfIn PDF document text
    • https://ghnservizi.com/file/16147324084.pdfIn PDF document text
    • http://clerus.hu/files/file/99405586115.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/goxodupir.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec18902514---67418917212.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/43872654374.pdfIn PDF document text
    • http://showdoimovel.com/files/files/givotar.pdfIn PDF document text
    • http://kyea.org/imageuploads/63639581262.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/rigipafimifuminaraw.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/79090936616.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/nijomawo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/zetexuvanazipumafuwuw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0a96c901f7167e8937122578c678d80a/62290095721.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/pajaxigu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tigitazevusetikox.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091014501861.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/19230292728.pdfIn PDF document text
    • http://dezis.ru/uploads/files/ledepuxijowuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+brooklyn+nine+nine+123PDF 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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 10840 bytes
SHA-256: 1e153b7c321fa6db75a19ec57ad98cb6036b225cfc208424b334dc4ce493620f
font_01_sfnt_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 16216 bytes
SHA-256: 6b24c187607fc7fda14af5e9595fb9d05ae7176573d1d8f9a14f9f32aafd1a4b
font_02_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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