Malicious PDF — malware analysis report

Static analysis result for SHA-256 0824774f7111af4f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac3fe9c84ca766afa319f1baf352067c SHA-1: 3f043dcd1bdb3e63857e187f3dded5e599ceca3b SHA-256: 0824774f7111af4fa6bfb14150ab542b1f056841310ae548c86d64916cf48f59
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

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://divetechmarine.com/contents/files/towaf.pdf
    • http://corporatiegids.nl/uploads/files/mexojipizofulebezamesodeb.pdf
    • https://ratsimae.ee/media/contents/file/xuxadugito.pdf
    • http://vitajeans.com/ckfinder/userfiles/files/bevisat.pdf
    • http://gianniarnaudo.com/userfiles/files/somewu.pdf
    • http://misterholidaysanprisco.it/userfiles/files/58519862788.pdf
    • http://factory-01.com/js/upload/files/55110050902.pdf
    • http://www.specemc.ru/upload/files/mitevoburopelopevoranoro.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/96564337819.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6af68d30d---51433440346.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/76110156802.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365eef23aa7---4838789752.pdf
    • http://samtekelektrik.com/files/96466119355.pdf
    • http://marienoellebermond.com/img/uploaded/file/fefikisifivi.pdf
    • https://drlanda.hu/user/file/zowefixu.pdf
    • https://theelementrama9.com/userfiles/files/25015888895.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/34273387437.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d6d5bcb1---tilitinekudakufojadoj.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311eddbb930---sozugeferu.pdf
    • http://jagamimpi.info/contents/files/31263787573.pdf
    • http://perles-del-beya.com/userfiles/file/ramobigunizopilasak.pdf
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pejisonunavita.pdf
    • https://panama4d.com/contents/files/bapunebulapinuxorodipopeg.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/90935154497.pdf
    • http://drcleancenter.com/uploads/files/202109051119251409.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pk+xd+friends
    • 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_off0000e5e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16792 bytes
font_01_sfnt_off0000fdfe.bin
8ad38d2031aa4c8f4d6d4b01b5d03b9e3cf265b49cacb9d86476802e828a3ee3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 10116 bytes
font_02_sfnt_off000114ac.bin
9afa69c79201387069aad9fb61ddeea56aba008914686bebe5ead037e80674e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 22720 bytes