Malicious PDF — malware analysis report

Static analysis result for SHA-256 659810a57df37862…

MALICIOUS

PDF

60.8 KB Created: 2021-09-02 00:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19906bc489064126e5d0c59b79c40086 SHA-1: 6a27ad243b917fac81b31076eb5920e26bde2d4e SHA-256: 659810a57df37862402001d74fdfa7e38edcb03cbc55feea7888e3e86ae376ac
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9587

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/800bc14cdf6f593d4dc3470bf67adf03/18676373949.pdf In PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/40315223666.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/032150eadaf0e4afd0e6b1538981e35c/guzavekaxadisisudu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/236a5b04fbc50b481b4f31da96045ae7/44913178750.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92947768436.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7bf12ed75---bikavizikulagavised.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/8705191763.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/797736611.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/24570645617.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lidujibafizijebopo.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/kewivulizixanifum.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f3b9bdc8f299c741d26065aa92634c02/26157334935.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/tivubinorad.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e93892b4ef7---dizepukisu.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0d238449d521d944f677a266de59f53c/tubavajaropanudowetimume.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f3f973a11---82596033060.pdfIn PDF document text
    • http://simonide.org/userfiles/file/37003398878.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/zumevozaz.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zigaduvomapexal.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/romikokubuluvibowozopan.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/76422778003.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839ec06a949---fulepenaravalenegidegiro.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4e1e582a015cd2470f827bee3a619b9b/niteju.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/xopepipofebewovupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=unconventional+meaning+in+tagalogPDF 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_off0000b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 15880 bytes
SHA-256: bfe848df015cf6b4f265202facba23a05f17c756f91faf5b018c2c75baf341fd

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