Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169d80b327456bb…

MALICIOUS

PDF

75.9 KB Created: 2021-10-06 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e7e495715cab8842d7fbe267bb23ef00 SHA-1: b549a696fe6f5c9b22e13c60049a24c21d995b58 SHA-256: 4169d80b327456bbd86c13705ce94b78286642ea078d749e84bb6958ed1a2ab9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malicious content distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the presence of compromised CMS upload links strongly suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3438306a1---pusakuwidagodig.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ed948d133---vebexedabuzitidis.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef71ec417b---sojevovetilututovijolaxas.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/92222272200.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/72041888841.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lvqt13act307ct1nh5p3b21t04/lusipirazufepofevopefel.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/34857452738.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109240022435937.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/94994312214.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/felepog.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/42085719823.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/68712396882.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbae61e33---bijodapefujuvaf.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/xafafarunivogalovenu.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/93880755326.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/39190690041.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfc24c8e2---29425614501.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/jebogofuvisufijik.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/tuvisetabomo.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20211001030503997.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/18903289148.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/42366775228.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021106130348149.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nimezovixor.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/88819348207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+are+storms+caused+by+global+warmingPDF 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_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 18744 bytes
SHA-256: 9daad19b89303a641053d3cea282d97bda64e986a4ae84120759ff819f224ffa
font_01_sfnt_off00011533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1