Malicious PDF — malware analysis report

Static analysis result for SHA-256 e831be5dc3b1e5ae…

MALICIOUS

PDF

80.4 KB Created: 2021-07-07 12:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5288bf1bc6c5b6871a3f0690b613083f SHA-1: ca5120fd73d0a5e463d9d6fdac66c2235ddd757f SHA-256: e831be5dc3b1e5aee40888c841807590fd0e4612a24ef339644e114c33c8f041
124 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress sites. ClamAV detected this file as Pdf.Phishing.Trojan, indicating a malicious intent to lure users to potentially harmful sites. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

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 https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6d00102a2cc6dbbaabb6a56ec328e6a8/68732341147.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/725b5a961cb636b7fe018f2963d750f8/sifokukiroroga.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14638843731.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0c74dcd2c698e678d9aa75b31cf1256c/28271123216.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/1bd6aj2302ue5k26g8crehd7f5/pikarefijoxolavujelexo.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/44608226462.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eeace6e04---38854990991.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c2825779---wixakofogasazudugeruw.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a895c0704---62852738478.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3e01e0f1b9e80572ad2909d7c5042c06/58227298532.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf745237c59---gaxuxedafo.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/detuvejerewid.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2gg6rmr6que7li4c8boppajj8e/9986022310.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607996578f78a---jipijidikebugaxisefax.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c83df2306---genofajus.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd852a1c6---regatevodiru.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/65gdi9bn89dmi8s8kf2bu231a1/lagumupizipitawulofen.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5666ef63f9cad14214c0a5dbf90ca2d1/lukojozimudijeridu.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/biranufefi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6qkjurrr680pujj8tu11tnbhpe/sitomafaposibosenikipuje.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/36986369416.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/80da3930d2458d8d417392d71f0f4e40/7703897826.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/37488700288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=exergic+question+bank+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 11444 bytes
SHA-256: ef6f095c23b57da07004a164a227afd4028229a9a55272f8f1b4ed52a1be416a
font_01_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1