Malicious PDF — malware analysis report

Static analysis result for SHA-256 a234c8fcdca09a8d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-05 09:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82ff303ea746c5be01658b0e4d843dc5 SHA-1: 14496e8d255080078493d843c9ff62da86348378 SHA-256: a234c8fcdca09a8d3ca4ec1f06fe4c71bdf57d658661a8e8494069174ed5189f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. These links likely serve as a link farm to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210630171126288719txj6ip.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70a862fccf---15752623388.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dq2o4l3glpluhlc0qqlo5mk2l7/nejusedukusikagixixu.pdf
    • http://helloslow.com/data/userfiles/files/jefubo.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/bojibuluberumer.pdf
    • http://weingut-suppan.at/files/25736945210.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2aksvk27a9a0f7gj996d6ao3h/kujuxojidoxuniguj.pdf
    • http://ufnk.fr/app/webroot/files/file/fafuran.pdf
    • http://vandientuchinhhang.com/upload/files/47930806932.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e205ebb---dumadefivefe.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a307e74b3ec---refutosunim.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/likumofoziribalexave.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b458832456c---80580637075.pdf
    • http://thaiboxes.com/piceditor/file/sakogovirijovijep.pdf
    • http://alarcon-v.com/editor_upload_image/file/pifusi.pdf
    • http://www.netcorp.hu/data/editorfile/25462151644.pdf
    • http://marty-triple-m.ch/inhalt/files/88411686591.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cf561581732699d1f6c046fe57c43c59/mogalilirati.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607422d391c4a---4832472293.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/34479e6e5efec98160303122b61b5edb/gukizapezotuveg.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/crs3ufjqpht38p35715bs8f2j5/jopudufuwid.pdf
    • http://tokyoto.pl/UserFiles/file/mosebofuxopepixuku.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/memaberadufafonuvakejit.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/86332614586.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/39993653390.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=soul+connect+hypnotherapy
    • 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_off0000edba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16792 bytes
font_01_sfnt_off000105d1.bin
b1529164b8bb0e618d8688b395a84eb61a82292f642ae307b22de13d4c97652f
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10500 bytes
font_02_sfnt_off00011db7.bin
be329326ffa572b2df2dda3579879b461b4a7fa3a896999227cfd875ac463a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 19856 bytes