Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3fede6c66e1480…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 217e82452f80869d253c26387ec68ed0 SHA-1: 0ee9bb51a76bf431d50ed1b4b99b9c4653dd89c1 SHA-256: 2a3fede6c66e1480758a8f208815d309c69a4ee2f542ac4490be7daab12f5103
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The heuristic firings indicate a link farm strategy, likely intended to trick users into downloading a payload disguised as a game file. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ae1c85b1bd4aa8b962ec1b765befbb37/23727826635.pdf
    • http://tebsc.com/clients/84181/File/90012869668.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/r7ibm2hrlg0beobf7bp1buf766/40413900750.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/tupixaropewesixup.pdf
    • https://hosvagyok.hu/userfiles/file/milagijopebunekavi.pdf
    • http://accessiblevehicleservices.com/userfiles/file/zagafukalu.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a0cc9b13fa2721ec9960bfd1d6daded0/kabibanekagupaf.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608ac0d212c67---37641510554.pdf
    • http://gunjanjain.com/app/webroot/js/uploads/files/vajimejibosa.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/18803600630.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a43602ca7d2---dotexezom.pdf
    • http://ahcxdq.com/uploads/file/12024720625.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a1f6750d---pifedalagixufibapeloz.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160769229cebbc---jejuwofozexajo.pdf
    • http://unsersohn.ch/images/file/tipikoleselufewekoxab.pdf
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/leginetemulaguja.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ede9ug8q8e2ragmkimenj1fa6j/33886108508.pdf
    • http://learningkey.org/userfiles/89233917941.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874c1026bdf---14100378807.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f98e915d---kuwite.pdf
    • https://clearpatth.com/userfiles/file/vivanapo.pdf
    • https://okna-stv.ru/userfiles/files/80700170387.pdf
    • http://capitaloffice.pl/fotki/file/tivadimemizoguti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lego+marvel+super+heroes+highly+compressed+android+download
    • 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_off0000e1c8.bin
0768fd9e2e729b2e4b6bc6cf844552231255f406c78a2152819d738a55997959
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 11184 bytes
font_01_sfnt_off0000fb98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16792 bytes
font_02_sfnt_off000113aa.bin
6b528bf5bacd425871935e558feb409dd9674e3dffc06fea4f1e100a37544a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 17612 bytes