Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a6bcda85c9f3ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 14:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff1ca93d8248c7f3d274ee4a8e979ed8 SHA-1: cf44b2c44c24a1e89f3795cc3cfcd47913e196f9 SHA-256: 08a6bcda85c9f3acab69d2fa9f7e76563bbb5db0ab58878cb41dc012aefdc0e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to these external sites, which are often used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=personal+financial+planning+textbook+pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc29606874adb3d30d3a7c0b47ca3dd6/mipupunubowevafefulirav.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/43072624554.pdf
    • http://sam-global.info/files/file/tuxeregonikumavi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3059c2c4a---kopuwoz.pdf
    • http://www.allatpatikapecs.hu/images/file/sarumi.pdf
    • http://magooferta.pl/uploads/fck/file/66601244876.pdf
    • http://debden.org/userfiles/file/puvabiwalosikuwesem.pdf
    • http://nextlab-semi.com/files/fckeditor/file/jazewifozixowebitebet.pdf
    • http://montex.pro/uploads/userfiles/file/jesuzadu.pdf
    • http://acquadiqualita.it/ckfinder/userfiles/files/39095118265.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/872d38d8b5fe874aa99cfd97ce124dad/42357782267.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/tibugofemijoturobubekoz.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c96366d62a3---17925895532.pdf
    • http://longbienco.com/js/ckfinder/userfiles/files/gaselazutabag.pdf
    • http://compufoxmail.com/userfiles/file/10632821844.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7dd4eccff07f3ff021e8889132c0bba1/51154775791.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/27661514031.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/b39gkdr7o2d9g94el65cbbokn3/21789059035.pdf
    • http://albertopizzetti.it/userfiles/files/kezugaxujaxan.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/18070964770.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16118f284dc89f---tinop.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe802146c57---pezifapamolekolup.pdf
    • http://kristenpell.com/userfiles/files/zemijofakol.pdf
    • https://vmwarts.com/ecovic/file/41639156580.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608381f00fb20---259982313.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_off0000e88a.bin
5d5544ecc20a0c9c508559ef490c5bc4315cbba77d9d1205ef3ea9ad697caccd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 11132 bytes
font_01_sfnt_off00010248.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 16792 bytes
font_02_sfnt_off00011a5a.bin
d4fef4070ecd6d17f0541d52e8f2f594ffe8c63a8996d3c7f7316e9301182e42
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 17620 bytes