Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d58c2a134c2ffe7…

MALICIOUS

PDF

98.3 KB Created: 2021-07-17 07:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a9658fb558c55f9411cd38fb90eea0b SHA-1: 3edd5d646db463204a1f416dd09cc5e1177b47ff SHA-256: 3d58c2a134c2ffe74a344ae0f4a4d01b5b74fd76eecd7ff0a378fec11b6a2acf
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • 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
  • 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://gourmethousemacau.com/UploadFilesfile///65223142992.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8b0cb70---39828669170.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japijewubama.pdf
    • https://paron-rebondir.com/uploads/files/65494191827.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094bed1b2394---51103597067.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f8133f70411ca15b6a0144dc0a9a99cd/85898395906.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085b00d5696a---70670539839.pdf
    • http://wsp.pl/userfiles/file/66910660406.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c22654cc---rexupulorus.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c579c8dc5---55092490682.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6d4292fd8193c94eae2a5c991e62e873/47539655066.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e1f0c570---kolujovu.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/ee800225dc33a922d274ac4837894701/burix.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607889a6c3fb2---tugukopewinuterutab.pdf
    • http://ccspevents.com/clients/24998/File/27845205855.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3hdl6aknecqlavf5s7pii67ta/69955899252.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k2sn431vtu0hj3k1bd22me3si5/sazixibotawazetazakazif.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/fexokamafojimawapodipek.pdf
    • https://studiorampinelli.com/file/gewumuleja.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096aeb3ba821---firototamar.pdf
    • http://castrolmintabolt.hu/images/upload/file/viramezupixopazofejo.pdf
    • http://france-ex.com/images/blog//file/nuxelukogoloxebadikafota.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/386766a2c78a293ec2b858e2820d9126/vakijake.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210704191421.pdf
    • https://dursunguney.com/userfiles/files/99436441519.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607a8711d38d2---kijode.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sexy+female+news+anchors
    • 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_off00011aca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
font_01_sfnt_off000132dc.bin
9f445ee604f8a418296267eef6cc9ef09aee6f93ef5d6f4b26f2491a5e6f1b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 18140 bytes
font_02_sfnt_off0001618a.bin
f9481c01291cdaed794dee906adf3e3a95950363de80d6ef39a811a1977d1910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1618A 10788 bytes

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