Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5f413916b1795a…

MALICIOUS

PDF

81.8 KB Created: 2021-08-31 11:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3f8b449471fb6fd8c185a299753c1ee SHA-1: da5a12461230ea148402b1b99b2f77097d95b6a1 SHA-256: ae5f413916b1795ae88a0539993ce74259587e69bc5eb5bd188acbb25dc5a672
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5885

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://eternoohydro.com/d/files/pabomowatevoton.pdf In PDF document text
    • http://odpadykj.cz/UserFiles/File/12584512348.pdfIn PDF document text
    • http://praguetransfer.com/files/file/50857822111.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2c6c66eff34a5f0ba72167cf13423fcc/raxejif.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/24495515011.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c808c8da---16041215581.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/pimozezojibufabi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/bakapupikoxabadirem.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/lugadopukuvimopus.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/dawejupifozipe.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fadd8df3f---kofelulunozopas.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202108241945432691.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/xoleluvidobebeva.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/74998615067.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf744ecdd53---sekonovoduzerokufi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106c1564c4d8---74733659289.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/28781464473.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/16526309141.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e682f6cd---37691037526.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0b6dda1c1b9b2573da3db801efa41bb1/wuwuviwowopode.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/rikoxutuvutajoragojebamu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jifakijurulajonuwelo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8847c1757---xukinofibunup.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8e39b77d---73982966869.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/53843637004.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf111db58---81715478435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=where+is+254+area+code+fromPDF 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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 10816 bytes
SHA-256: a380f8f4ad4ade42637de93a463c93a5b5c8c5817e543109ffe9e2657fe56549
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 17540 bytes
SHA-256: 3ea2f850334d4b3b4397ffa63f98372757da0be81d0537d028cc7bc6a8921066