Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26c106517b1f5eb…

MALICIOUS

PDF

80.1 KB Created: 2021-07-06 06:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ee937f304cbe7b0c3f996609c9ae765 SHA-1: e33392c7459fc50ce069937bf106dcfee5b9c536 SHA-256: c26c106517b1f5eb5ea890adab2228eb79730b10ce1af007a8f92098bea2b30d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5698

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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608045ddcf156---81268129977.pdf In PDF document text
    • http://divorce-difficile.fr/userfiles/file/dowulinala.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/84365733006.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/26117917386.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/pejuwebavizaresikam.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/21410114983.pdfIn PDF document text
    • http://soles2walk.cz/data/file/93944328874.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b5806d2b255bf8e991972caf66f451b9/50938931556.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/pelarixisuwonupiboned.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f627043f59---93285747200.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/67089286789.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81994c5cf7---fugepuxajupulatawine.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094bffbbadb6---36547124076.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/80215469869.pdfIn PDF document text
    • http://altinay-law.com/images/file/gejazejoni.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///40454713187.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/padafimodi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/b5e7019798d19f26efc72fde0412d507/76989963267.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/adad0f87e07b705fba0f5b3ed0d4f35e/mufemenuxovumofaf.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/258f4ca246e17b50df20f8f39aa4645c/wumadibexutojoj.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ede9198c---xofetoboxitigimatazupaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=examples+of+green+initiativesPDF 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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 17824 bytes
SHA-256: 19f2d1f9c2070b75bc2f7204041fa75d69160de408fc1baff14703bfefb07c83

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