Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e3baea7916c6a8…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 12:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13520563374b5c92b4cf10d322337edc SHA-1: a27d438e926f71faf223f5cae9e52d27209820c7 SHA-256: f9e3baea7916c6a89fc8c7b23aee95d7b24dd192afee23b8b113f7596aa789a5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely intended to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gwtcs.org/Content/uploads/files/josem.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/90612137531.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9df43f1fd891aa486df9804ad26c9176/46516805546.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/83855613277.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c9ff2b87---32524705349.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64abbd1cc---1076766796.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dadb98dc64839e207f7691562426e821/40716218381.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0ac44ada928b9f8b9d71beeb1b44add9/wugusojobigut.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607763e9e9099---sipanimuna.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8d12830213d5ffa3baf1d31b55ae86fe/90560780620.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6e37a4e6a2a49044ebb929f5b093ad6d/92210597333.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/841ed692be05ee2453e6a005dab0c63b/23628960649.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/kjldeh9pfpp959jco0v0gtre98/57096175490.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b11bd8b5f76ddb9eb24f4dbc3778740/37007283231.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/69042219940.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/wananupak.pdfIn PDF document text
    • https://famecosmica.it/file/jukajinul.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2b3b4623---zulavasojobejifok.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c301a335083---65787505501.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/25179459644.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcb1c41ef---wuzarex.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9205755185---pipikokoxiwor.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077bc8365a10---39486597431.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c271b599462---kamikavisibodubilot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fire+fighting+pipe+material+specificationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 17160 bytes
SHA-256: eace67b8a85dfa70dd34ab6e365ccb60e06c869ebbfd649bd4287432959ea917
font_01_sfnt_off00012636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12636 10904 bytes
SHA-256: 931bc5abf85eb7a16d2e5c54f32ce2cc02ed35cedf8f0d99e6843485426c2f7b
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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