Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a2c7cbae99ac0b…

MALICIOUS

PDF

65.1 KB Created: 2021-09-15 21:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 13bec3bdfc226c90cbb57226a56ec499 SHA-1: 5baae3da590ddf857f4da1d9c2ee9dd01b7ff5f0 SHA-256: d5a2c7cbae99ac0bca5375d5186e2a7d6d5726c4c738922b7b97ac6447a2ad20
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to obscure the final destination. The ClamAV detection and heuristic firings for 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme. Embedded JavaScript streams are also present, which could be used to further obfuscate the redirection or execute malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4228

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://minlinart.com/archive/upload/files/zubibumirabevifadob.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f71d4c17---157827346.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e906daeb2---salilasumepixew.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/50a64f0045c03f7c47651cdfd8c16f0c/zakitagoradu.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631065610.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/36945449864.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/77644162699.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jolan.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/depeguzimelatirupopanef.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a995834a79---61969455802.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_C22215CD33E9D566.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/pusejaxalezefulum.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/2102146327.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/kuvesug.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/kawolulu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/506267d472fcbab83c1544a791d89d47/2898551733.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/61290129106.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/keritariloduvumuv.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72504208419.pdfIn PDF document text
    • https://sambelteri.com/contents/files/watuta.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/14913489290.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/pororutebifisigisim.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ded09b1f---10150517095.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b612d8a34231f8ad03d6062b29bca57b/85792696087.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/zupifumovija.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sofuforegakobujefelaxoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+storyteller%27s+candle+pdfPDF link annotation
    • 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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 14344 bytes
SHA-256: ad286d945722e9a733d08292273eca901d271e43539dcf329939f12ccc46f8b4
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10736 bytes
SHA-256: 2a4a2305feaf087dfb4eb3f4731f56c52efbb27873d5c3e443534467f13b8c89