Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e8aa2b046398b8…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 13:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 883974225b9b45a1f94e95afec0ef103 SHA-1: 4092165c2b7753b7eeab0b81526cc728adf727e1 SHA-256: d9e8aa2b046398b8130bbd63928749d8acc0d22e11ab4371c2a1f06d7a30154c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Multiple heuristics identified the PDF as a link farm pointing to potentially compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8532

Heuristics 5

  • 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
  • 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 http://jualumnitoronto.com/editor/uploadfiles/50465511861.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b575bbccb19---fuxexunewasulek.pdf
    • http://cs-web-design.de/ablage/userfiles/files/74722957625.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c898a743badc79ebf85d48e34554b543/senizipusumomikozasijeris.pdf
    • http://valdhans.cz/userfiles/file/57846737099.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61248975949.pdf
    • http://7seapharmtech.com/Uploadfiles/files/64293122756.pdf
    • http://lgassociates.in/uploads/zelopixamuvakas.pdf
    • http://dancedynamicsla.com/clients/38740/File/96232228199.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/fakovobojajuzef.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab6dcc095b---gupiwowofomud.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d482526d9---11350151251.pdf
    • https://dafelia.com/files/xinesafadoxunifike.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160856aef82453---zewasolinobi.pdf
    • http://musorcentrum.hu/files/article/file/setopobuwevolotogana.pdf
    • https://home-consult.lu/userfiles/files/gituxolid.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a597ba44baa---losufidenakezu.pdf
    • http://lnhaihui.com/userfiles/file/20210826184642_635099136.pdf
    • http://alexhoffordphotography.com/temp/files/file/69425964544.pdf
    • http://hoangnamjsc.com/upload/files/pavumemavemavosulugokari.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0e54e6dc---vozeg.pdf
    • http://musicpark-live.de/userfiles/file/36323889030.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/jolazulofisurusimemimov.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ouk07dgtgtatlispsd0hffjft/voneziveri.pdf
    • https://www.medicalbi.com/ckfinder/userfiles/files/33550803516.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f836c8a4---pagefujajivoke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=eva+valor+economico+agregado+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 16792 bytes

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