Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ce11ac83bef37…

MALICIOUS

PDF

67.9 KB Created: 2021-09-02 02:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8de9411ea64708fbf988eb56fa9cebde SHA-1: 2c4c2348d0e18d41f65fe7e5b9f2df4452189c55 SHA-256: 829ce11ac83bef37aebb24296b367b5e7e7e7d6d1fb318d503c797add6f77e3e
154 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm intended to redirect users. The presence of these links indicates an attempt to lead the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819cb65c562---18883783850.pdf In PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/ledesoxulujigoki.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d97325f7b0dc6312ff9ddcd40ceeff4d/ximutuwo.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/jejufosolujugojikatud.pdfIn PDF document text
    • http://chinazzjx.com/d/files/siduzewelok.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/tejof.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jufanelel.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/nefodabezukujori.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/82406648925.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e506f1527e4---13203556622.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/eb8806d5594c4469f6a60edeb850c9b8/berud.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/wodewikuzekubejetatome.pdfIn PDF document text
    • https://airbays.com/userfiles/file/jomujepatimafodavafo.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/8347850996.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa524e893a---sotazemevisewukupofef.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c29b2dac---xomelosa.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/50969116158.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/tividewulagojozi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bac9be6b1---47313993632.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/garamogizeba.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/23443202243.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/wuboreveguji.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/3625090238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=maze+runner+death+cure+page+250PDF 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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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