Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90773b86091cab6…

MALICIOUS

PDF

65.7 KB Created: 2021-07-13 19:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a614f037f6bef12c441d24d2bb8167dc SHA-1: e27f387da0e152ca6d80d781f6334cd507660b3d SHA-256: c90773b86091cab6b4f7d03bfcfb5984f5ee1bfe125845d1832ed5635111ac10
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV. 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 suspicious score 0.4869

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://eva.am/files/bda41f293906fad9.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/84821072898.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/1103546394.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/bejetuwoxogesapa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmnp6fb2d3bs85pms9bl7rb1o1/zusudemabexigodigisineja.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/kesuwakutolibupolakajeje.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3156f34613e2f8e212c20e8bcaec260f/bitemadiresale.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e32ddc3dd---zupijetimatidugujevi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b90ff8a24af---6401377007.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/warosexaninevivojuvusira.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/976e5302d4c6d58bf778018d9306eded/36884873936.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/98837829152.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210613/file/16235621888932.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0215e178---21621818509.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac789947bae---77214246227.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd6b71b7a---91171073448.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4601acaa---bujoniputimewefupulopuru.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/jdsm1jn20sda8as5js9k1ic1gj/riverujisubud.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/33858215339.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b124b1d8680---gizifinetinisenufenuxa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/89546062993.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fa33a5f91---98300946620.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/52997571758.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e7261cd2f258f6555b52d83548101695/disufisilidif.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/53545662752.pdfIn PDF document text
    • https://aspirans.com/files/file/wivivaranerajizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pretty+nails+and+beauty+spaPDF 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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 10620 bytes
SHA-256: 6a9290d19b2dc0f117db97c6cdd49977aeb9e21ecb6ffb82b02038a09d595954
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 16580 bytes
SHA-256: cba7d3f2c298f83c93ecd8afef3286bdfa6b664b7b0e7a446d39e73fdfb0d24d