Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec7402ff3662ad4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 03:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2b468245187b3090429f3f2b3b44660 SHA-1: bba7989857859754e8124a7690ef0d1c99309707 SHA-256: 9ec7402ff3662ad4a8180c662e010d2d06816e81691724d25447c52509eebcdf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicates maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of these links and the nature of the hosting indicate an attempt to direct users to potentially harmful content or to artificially boost search rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=serato+remote+for+android
    • https://syteq-pro.com/userfiles/file/59696083156.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614208f995995---15221047868.pdf
    • http://z-sinpro.com/upload/files/97552202292.pdf
    • http://gpsputhuppally.com/userfiles/file/vazab.pdf
    • http://mclarenquartz.in/ci/userfiles/files/78659864652.pdf
    • https://cissud.eu/uploads/ck_editor/files/rasirotevamubijo.pdf
    • https://angem.fr/userfiles/file/pavaterekarev.pdf
    • http://fnathservices.com/upload/file/fixuteve.pdf
    • http://stavclearing.ru/upload/files/vajuv.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/pibasi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c477094a---lonomazimuxefugif.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613061d597cbc---gobev.pdf
    • http://ntvietnga.com/upload/files/13201309348.pdf
    • https://henseltech.cz/userfiles/file/xijilazavutegew.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/26562744759.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/1516156408.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c59hesop2etjuft61khhdfaeh1/tuditatavozor.pdf
    • http://jjw-led.com/userfiles/file/fopiralorapudonufabiz.pdf
    • http://www.findvoters.com/userfiles/file/negaxabo.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c98b9e88b---junedola.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/ligomaxupape.pdf
    • http://www.cemeba.com/uploads/ckfinder/files/80333051198.pdf
    • https://manorhair.com/uploads/files/202109171757517897.pdf
    • http://emilygrilltogo.com/uploads/files/56778477102.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_off0000e57d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16792 bytes
font_01_sfnt_off0000fd94.bin
44334a1db2e7d0631e40243ccc2281aeb8b47c0317943ecdc4cb78d1a8c68e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10376 bytes
font_02_sfnt_off00011504.bin
c65886308e87fe4b8688770fb55e7a0c88a8a57dfc7bf3844156b95affa649e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 18560 bytes

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