Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1dfe44be56ddc…

MALICIOUS

PDF

64.0 KB Created: 2021-09-07 17:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 894fe86a72eb8e99787998b7f321af24 SHA-1: fa202d81ad9bfbca5f3e7ed948b5e2b5b7acc834 SHA-256: e9f1dfe44be56ddce5aff4ce7700b4025b278b2f3f4b506ea9819be97cd829ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to distribute phishing content or malware. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights this tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8380

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archism.ru/uplcv?utm_term=delft3d+water+quality+manual
    • http://learningkey.org/userfiles/renaso.pdf
    • https://hometeamcorp.com/images/usr/zamofewurixifuxakimuw.pdf
    • https://pendekaremas.com/contents//files/31020870609.pdf
    • http://apexibd.com/uploads/fck_uploads/file/notixonawokiw.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/gopiponixuniwiwamokoso.pdf
    • https://aedwea.com/upload/foto/15236502406.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vug79ikhv1ccg8fmbu133inu0a/vonimegolamuvijatitu.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f982e29c9---tovazenu.pdf
    • https://pierrelemagicien.com/userfiles/file/moronerubisawaretutivowif.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2f9587576886b455c989cb8de72307ba/66244497713.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a295b7d4---24740944126.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617c839c9d---pegunuxezegemupujoz.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/16745822913.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/rugukigu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f222d42bb22---gamexagozu.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/94fp2u0n8s9998u9gus6s6jts0/xepotijukiw.pdf
    • http://davcpundri.com/css/file/joxudomomideruseti.pdf
    • http://yas-center.ru/userfiles/file/25331928579.pdf
    • http://jolanyee.com/upload/files/202108301544575523.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimepeweponekubikamudutir.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 16792 bytes

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