Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e5b98f75ac28d…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 12:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9da5cde57ef26126eb9a7547bda5c84a SHA-1: 74fbf74cf93728f19be129cb8f9b0cfffd9ddc84 SHA-256: af1e5b98f75ac28d5ad2369776e69b7ae8eddafcbdbf555a4225bb68dc98b17b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and the nature of the links suggest this PDF is designed to lure users to malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4197

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://irlanc.ru/uplcv?utm_term=signs+of+epstein+barr+syndrome PDF link annotation
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ac79a64d---kubosirunijewewileseburur.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3aceb661652b04e82c8be2039623ae45/49186479873.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc204ca631---54841752166.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704cbbe3a6e---wamawepogaxebopuwovipimax.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160940886d649a---tabuwevopumupotekeriv.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/52cf5a0e32eddcb90b50eb7d4889f29c/vasaga.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/egquhsel5n39h4bdhklg5rn024/fumipapewo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukupusifapemedurejo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf9ed52ac---lufivawikavakererexurovi.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/48180776442.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/penomitaga.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2871d40fe1---jodibog.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zibubiwufog.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a63562b08---3400510367.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b1340b56134c732593ba0c53da5a9682/41017741405.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49b8a8f021---pumobigilofilakokumexikiv.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ba1f2ed06e55c04bc551986ed3a43f94/97273470803.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d8445e950c869461e6ca1fe0df664d2/famir.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/gawaluki.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/regobajutu.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d94f1be6---vamimawoju.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/12657024784.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5797529340ccff7bd6ca78f61c4f6b4a/wijatimelaf.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f20bbd15---gepuwejajunigapijarom.pdfIn 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_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 11124 bytes
SHA-256: c400eb5df13c53ab19dd4cb82d8c8200e8832cb5523846efa2862f34e18600a3
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 19588 bytes
SHA-256: 7bfb7296c1f70c0d2ab0d4b5edb05ef83383665cffe284f7880dff3308041ffa
font_02_sfnt_off00015fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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