Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9a9e876b59e940…

MALICIOUS

PDF

60.9 KB Created: 2021-09-07 08:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 755a7afdc1f24be60b48bebac62c1aa4 SHA-1: f6436acc147f0617d659ed19d53750b4d1a57f53 SHA-256: fe9a9e876b59e940fb8039ad97dd5f0e7868a8af5cb5c1d27d426809b6dd0144
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6102

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=leadership+roles+and+management+functions+in+nursing+9th+edition+pdf PDF link annotation
    • http://churchtextile.com/userfiles/file/sikilonudidivepobexadix.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc0256235a---82003301744.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bd05a3e06d83a48ccf5bc5452aafcf71/mivenizedamemopipuba.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630619937.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4852aa1c7ab5cde71bc274d7e7d2df2/lutadanaletalewiragovop.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098447d73013---26650316873.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/27303411589.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f0fc1e23a448356b64442826e5331ffa/wotilapeki.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75974ebeb2---nazusotidimisikusozituj.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021081021413280554.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/83857781460.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1afmgfek23ovo2ogchjf1q9fk3/84173023989.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/30902774089.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc92041ecb---nukesujufopojula.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/juwariderizunubifez.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/44867831949.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089595c51189---talugitiboxetukavuneges.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/muxikokoduwufipufid.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/junesewisubigaz.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/xiripapisuxetiloboxawide.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/tesulawugovifakibuxudag.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a720ceb7---gajuxelodobizowam.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/sopuwipezovuvu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/62f02cde3e7312cc68371eee8257a6ac/mokajadodutavuva.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/xerevofuno.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119d995b93cb---tetasase.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1