Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee89fb43a035eac0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-25 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f05aaf0f3e20c7236d8e65d9b57cced SHA-1: e557d57c0e84724a7ce8f33c8556154152a9eb30 SHA-256: ee89fb43a035eac019c9549746b806561546caaef5deb28376ee1ce47fd38950
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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 https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/efcdfe1313a466392d7a257cd69faa01/1329971972.pdf
    • http://zubrcup.by/files/files/9245832789.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/98088463013.pdf
    • https://manuscripthandler.com/userfiles/file/70770227945.pdf
    • http://bnblspecialities.com/userfiles/files/marubamuvazubuki.pdf
    • http://domki-kopalino.pl/pliki/pixulogad.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/65987936751.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1630907729.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c59c90070---91078874750.pdf
    • http://ilkemymm.com/image/files/63591287733.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/gokavepeduxibimaz.pdf
    • https://sysyanginguvenlik.com/uploads/files/futagojofilarapofixozulen.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/75074247661.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334ba03baf5---23832821527.pdf
    • http://ping-property.com/user_img/files/lurimanapisukogu.pdf
    • https://e-room.co/userfiles/file/31056312651.pdf
    • https://agatanorek.com/files/file/melatewivubasenoliv.pdf
    • http://mqskin.com/luutru/files/55086304390.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138461d48478---vovanepofi.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/6159983824.pdf
    • http://ecohouse-lab.de/userfiles/file/bisoburonopomegulotijegug.pdf
    • http://nanoscopy.ru/uploads/files/jilira.pdf
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/fiwifajanupulokadatakov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+spin+coin+master+hack
    • 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_off0000bc9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
font_01_sfnt_off0000d4b1.bin
ac662737aeb8f5af58f5c171d8a84a0fc76a864f1b46cda2fd1b9b410fec1269
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10664 bytes
font_02_sfnt_off0000ecec.bin
86d15538d9a51f91387b34b7271b3eeb3d1e5d8aca07489d4799d1d89f6ab530
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 20160 bytes