Malicious PDF — malware analysis report

Static analysis result for SHA-256 be48a38280a08b87…

MALICIOUS

PDF

70.2 KB Created: 2021-09-17 22:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c4b76ab60296b40a60775ab4fcdf8b2 SHA-1: feb708b42200c5ab746389df70d0c23b5428ad0c SHA-256: be48a38280a08b87c4d74dc650ec53224f5a101c7ed187e962d0134b5fe2c6c2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for malicious activity within PDFs. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5042

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://olterus.com/contents/files/xilivokopem.pdf In PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/60321238518.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/wodepo.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/sikupu.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/xakerevokalepez.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca9ebbedf---68367308478.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vamufodedoraxebosefep.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca2d1dd69---mereme.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614003451c0e7---soximolipuvug.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/nikukobuzumoves.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/79089450056.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109080549185592.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210910_808872C6DF88D543.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a74a4ebad---nilav.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dorifukiwupulibek.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/46210141272.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/887355f3e1cb90e0d1d6ebe4c635689e/molesonurosoka.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/81323265714.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/22443677928.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/47808246614.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fezogexutomupox.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/73542341368.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/26952668853.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914140855.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ledafoniwuxadexewojafume.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/71314553778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=name+the+biggest+and+smallest+landlocked+countriesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1