Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8841864f34f2207…

MALICIOUS

PDF

79.5 KB Created: 2021-06-30 05:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4cca9fd331e49d44b550053d04ad6f9 SHA-1: 0fe2e394c8c18c2704349b3ce0b5b6969b71c4b2 SHA-256: e8841864f34f2207bc321635721ea27eb6b357b64bc82542e4d525cd234e85e9
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 external 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. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32b4eb44b---157027854.pdf
    • http://efuturesthai.com/uploads/files/winenarun.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/filujigifizapiwafolanafi.pdf
    • http://asustainable.com/global/file/58553622354.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d797837f8d---91402634992.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/23583392599.pdf
    • http://crackershrimp.com/file_media/file_image/file/85393693091.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cbe73263---40029889262.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea2c938d---33087125779.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a564486f---vaxuxotexe.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc787ad38a---lotemebis.pdf
    • https://renebeumer.nl/userfiles/file/9337656114.pdf
    • http://apexnepaltravel.com/userfiles/file/tiluvubaberedorudapazo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/14343fdcae1fa74acc97a440f21c6806/35014177412.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23802144ca0f71cee8cc85d6b9b4bf8d/wesogaketijiron.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160918d8078142---lawumulupajexuvomefot.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b3ab80cd463975f2ae5ec75e9d99f57d/muxujejafo.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0b35084f---51611367979.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/920779116f288487a783fc7ea7135085/97636859909.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/q0e3mfniu3m0td3nbibb2upaqp/73443265721.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5jms0euf79b0m25m25dddjhna5/44526498169.pdf
    • http://domholidays.com/userfiles/file/90629971825.pdf
    • http://kapelski.pl/userfiles/file/binalabexemir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=other+the+other+another+exercises+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_off0000d2b2.bin
2413e1281a7c43a1d4e7397f2af032df0732ec90d92330bc3aaf86416b5cb26a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 16588 bytes
font_01_sfnt_off0000fdc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
font_02_sfnt_off000115e0.bin
9a6d73bd8c24ef8fe84d93f094822e82e2bf17f329bb40a9b15d7acb679b21ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10796 bytes