Malicious PDF — malware analysis report

Static analysis result for SHA-256 24475b1d985cc0bf…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 09:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b585e1271529c0df3e58ce079475ecfd SHA-1: fd9ef21713ab91b74371454b70e98d1490d54e82 SHA-256: 24475b1d985cc0bf504f87644a60836a59a4e032e7e6ac3ee26ee9f00ba48c61
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links strongly suggest it is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0042687---tiforixijip.pdf
    • http://yuha.be/_files/file/58964133497.pdf
    • http://tunglamgarden.com/images/fck/file/lulumunuwibosip.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/tq5i528d9ma1bd82gm43tpl811/vajezinafavomid.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1769695afd0a89780fd4635fc530b651/gotivu.pdf
    • https://searchkar.com/ci/userfiles/files/jazopazomolome.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a352577f6f0---30383564808.pdf
    • https://yingzhaoliuart.com/upload/file/bolivun.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc58c76ecb2---badepog.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4ibtlfe8psjpmn1mo1ac58j26b/4486523174.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160714e5b410a7---renakuvavitavokifixibo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c4bca176---67282120710.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qhqpig6po1pg921jcav46ma2r5/1286618235.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/16055436327.pdf
    • https://hostessima.pl/userfiles/file/wupubefakanufamis.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/sinekenoro.pdf
    • https://accuratesearch.com/userfiles/file/witiwodu.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/gupg8iikgqp9agf7tupjgq1j3n/26842876692.pdf
    • https://coil.hk/upload/files/76188441111.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16235718964411.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085663db48d2---bulupebifokigarifixideb.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/bok7uap10orr7ncqfusp0cg3m7/bejiwowu.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfecc6cbb---kibovidalabikafobagowunuv.pdf
    • http://babamoleskine.com/files/file/jemogixiju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=design+of+industrial+structures+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_off0000e866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 16792 bytes
font_01_sfnt_off00010078.bin
553c60c93b4e5266e869df64e93d1a98444b1dbfd7f0ff74d221355a9f21853c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 16652 bytes
font_02_sfnt_off00012bbc.bin
07a7e654cc37c371c9088ec33dd5d6a04e837393cfe41ea790e7c04339c210d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 10896 bytes