Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee452e9ed2b2b9b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-24 14:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d613a880611d369a0915520f1b8f67cb SHA-1: 358bc1a7040774ecb0f3147588df90ff8c415642 SHA-256: 4ee452e9ed2b2b9bcc77bc37428b55d8a1d78f4bd3731233f3a342061157307f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these redirects. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://whatproperty.ng/ckfinder/userfiles/files/tafurivewajeso.pdf
    • https://cpsguffanti.com/uploads/file/memorek.pdf
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/99049657170.pdf
    • http://brainbond.ro/userfiles/file/32382819318.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f4b6d7f2---35093962414.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608389fb26b1b---jededapamopu.pdf
    • http://asianmosaicnyc.com/userfiles/file/jegarimepajodam.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99614106c7---28159244813.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5620090ee---46460321786.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e9d145e---29715201481.pdf
    • https://paklya.su/design/img/upload/file/24245748470.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b8e7f2280d0965e64191a2d3af8312b7/wexujojupezowetedipof.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/niroravitu.pdf
    • http://aihyang.com/userfiles/file/nisinakuwezomipudakop.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5979f23614891b2518e702ee54058b6d/wadomututajeruxi.pdf
    • http://fijiembajak.com/uploads/ck_uploads/files/zemekaxivubirikawevitonun.pdf
    • http://annandale1963.com/clients/69704/File/23487349291.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc712893f---tenitexeruruvibopu.pdf
    • http://tuderprogettazione.it/userfiles/files/gajisamijoxinimizu.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c1dd6bfba---57126291400.pdf
    • https://yar-net.ru/userfiles/file/4645067835.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/75730063086.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+program+auto+mate+remote+start
    • 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_off0000f096.bin
794d003dee1151d6de3c2272ff42969d1406c6911a03fe0259b8b45c5e7a3808
pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 10532 bytes
font_01_sfnt_off000108b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 16792 bytes
font_02_sfnt_off000120ca.bin
71d63e29252ad0941e2f1678094b1cc18f7cae9467d191117dfe576374e7e27b
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 17768 bytes