Malicious PDF — malware analysis report

Static analysis result for SHA-256 321919dda13e2efb…

MALICIOUS

PDF

85.9 KB Created: 2021-07-05 07:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d74923d677a176ee72e9ae20cbb86712 SHA-1: ae736c698e15e8ec0816286566ccf1cb1bdff528 SHA-256: 321919dda13e2efb42ef063f38383bce9a6baa04a65ec0ca378d5965b18963c5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or facilitate phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1651c070d---lifagutoz.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/uarngovo94t3s9ih3i3b74k1q3/36466697994.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/d4c91b.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nkdsreoldh551fi5l81105p0f1/bevidavafemo.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/53132618806.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9b3761cc---lenedaduxifololaluzum.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/82495159213.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607442176ff9f---202901579.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71c321b30---66203477253.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/deaf8d2d00e6ee80d70095318ee41d64/gitekibelolozonivejiguba.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kozoxemekawopujobanetu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d180cab9a8fbfa9b06ea04bc49f63e80/xulasowu.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/vesaz.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b282bccd3---vetoxebulonogila.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a7a483680bcfce81390589f409c252bf/bemir.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d0e0d5ed6---gigezaxa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/26942837104.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e090f837875be83e9d55dd9df8a04ece/6593553357.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89230a428---80742860078.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/umc8hl3sejtp98uqhduac6j0d4/gigewumizopibuvawu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608405797554d---jetijapakulitukejetezul.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087593fe5de5---kitodazilawekifixinisudaf.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/2399l5ugom0lvh912lsj1rpr11/63427026612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+train+your+pitbull+to+attackPDF 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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 10588 bytes
SHA-256: e8a101bb28d021aff7c8ce80e0b5dc27c2699dd572da5438aaf0623ce38e0191
font_01_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 16676 bytes
SHA-256: f4ea53e57359cd8206798690701090e4287819dedf082c92debcab6e2e636e6e