Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2dbe79b0866e36…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 11:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8245f01dcbc40a1e52e7e48db89b6558 SHA-1: 3b93aa1e05f351e28e4acaa5e9d14efeb293b3d4 SHA-256: 5f2dbe79b0866e36d14a57c5d7f54033e85ead4d506dd4cd809b67337ccb12cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://zoekidsworld.com/userfiles/file/86279578374.pdf
    • http://teechart.com/uploads/images/files/rafakunoduso.pdf
    • http://rasmesafar.net/basefile/basefiles/fovulovawus.pdf
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/wopuzomisasaka.pdf
    • http://studiolegalebisantis.it/userfiles/files/gokudiwexatibadoj.pdf
    • https://gkia.org/kingkong/userfiles/files/42069806606.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/t5kn1qdgnglo2ejf8m2csq2ubm/39678078015.pdf
    • http://teplo76.ru/uploads/file/wezolumijunofujamozason.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/tidisosoxoruzuxigofozagur.pdf
    • http://pharmnet.cz/ckfiles/files/files/kotujimafajaberagazumaxa.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c9daecf8---xamenutilafedorisijosito.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35bdc7d8---jokiwowumomijusuromosa.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/6984193800.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/xodifebamemogejomuvuvifog.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4audl97lqm6rdq6k5r4a8pettt/43398566604.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc35233ff4---xibatimovifajeripixuta.pdf
    • https://coebmsf.com/userfiles/file/jagipixarevupewatowi.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/615dc059c7c55eb47e71de3bf99ec24e/36440207243.pdf
    • https://mfdesign.hu/files/file/mujaziguxafuzogodabo.pdf
    • https://cfbadalona.net/ckdata/files/wawuwonepoguju.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/34142324047.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51267f6da---punesenukifas.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/67558912ce72dce4896520239c6da796/zebiposijusuvokugal.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/gogenibetopenupitajin.pdf
    • http://arcomproltd.com/userfiles/file/46977867700.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609f07ff12c7e---14200238156.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=separable+equations+examples+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf21.bin
7f9a87cf27171a04c78a839917240ed20e0610070ae1932f352c058731046863
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 16136 bytes
font_01_sfnt_off0000e8ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16792 bytes
font_02_sfnt_off000100c5.bin
212867a13329f92390a81e57fb5d9f80b829895304fe95a6bb1723e3dc5c8d79
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 11224 bytes