Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fe59b3214f0d34…

MALICIOUS

PDF

72.9 KB Created: 2021-06-25 18:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cb1652bcf247bb67486781212d9fd8a SHA-1: 78ea63a28089ca9e63b3a6fc6113b29b08244971 SHA-256: c5fe59b3214f0d34a0d439e65da78fb5e07880b851687e6080c7e75dab401190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://school19-zav.ru/userfiles/file/rufebelirisubirefetini.pdf
    • https://ludifrance.fr/userfiles/file/3495668611.pdf
    • https://5uempat.com/contents//files/49332326901.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/o3a051snma61svochri2bncq94/lapevinenaf.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2d41bdac5277e568a8c8fd3cb097ae8b/migeruwiwixesofowit.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c25e3a51---83604156097.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ebeef3e85---pukasexenigetadadi.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/13181477118.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1e1a64bc9b6df6e6a4c053bf112867f4/rumax.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e3ddc7444ffce7ce809f56075560c939/35430182778.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca378ef86a---4072805645.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/jtgp898r5d01gp24k46eob4k9t/kijunanez.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd85ab4fe9---91569534852.pdf
    • https://study4student.com/cache/fck_files/file/zesijadexi.pdf
    • https://ihotel2b.com/upfiles/editor/files/beludumikosomowugavubas.pdf
    • https://dolmalatrek.com/userfiles/file/nomaveromevejatezuxox.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223afedf0b---36275745967.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e769c122---kazabagewof.pdf
    • https://burstallconrad.com/editor_files/file/penizowitusudu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0266a7ec4---buwunipejiwif.pdf
    • http://capmar.eu/userfiles/file/newotevepupamijevonumogiv.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160995c8e9a12e---81721307493.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609a711ecdc72---25813782948.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8c09c5e9523ef38f87bb1bd953fecfb8/zafopoditij.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e8c7a8b3---titux.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/efcf62f3874b8ecc9e462ef59223d002/59593506047.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=health+education+of+antenatal+care
    • 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_off0000bd73.bin
0149f1a4c96771573867d9bf3a649e311de8fcb34f63d250cc129c89c29c57e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 15888 bytes
font_01_sfnt_off0000e65a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 16792 bytes
font_02_sfnt_off0000fe71.bin
2aa6b027ce12b53ffe6f32e82a5c65e9e9381641a040c91a8c984ebe88c44312		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 10496 bytes

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