Malicious PDF — malware analysis report

Static analysis result for SHA-256 5170799b4d6f730d…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 05:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e50c4ad52db749b94794e4c250a55b02 SHA-1: 8e559a03eb96a3885df5470b8c7944f6ec0f989f SHA-256: 5170799b4d6f730d899caf748ca0b9d874f5b5e43e921f6ed4f3580f680d1f92
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rcb4kibk0qldelnkdvpsa6ghv2/gidewofubomuwige.pdf In PDF document text
    • https://amblamy.ee/upload/file/7839774992.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab8e3f211---77383078082.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/29602447889.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442355c2c7---dawavolekowaxosemof.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/s72ieujshd8i9lb3hk32p7df00/fojudabimujujilopip.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/kesage.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zuvajuvimola.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/11elsl90ao8dqe3rnq6hil3pig/56736264120.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304086d38---62379937921.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9795e4f2e6---48527430124.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nopedukolejotusaj.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/48ebde6b198352b3f9a3fef4eadf9461/zolifusuruzomopideguni.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/82285416832.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/totododu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c321402cc1a61af5f204de40d4cbec4b/88203671933.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/43060104628.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/49100309826.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e1483cf9---xusirijadotasironebutin.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e906a530f8---xokiwigoribebelomerur.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/kijerovekezuxuwejuwul.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/19866547204.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/jofazagi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2uh7bsjjtnfrtel7lu1tdph9cd/setivole.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b561d07bfe0---78070297216.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e40073466---31107519296.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/23763987954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=3+major+planes+of+the+bodyPDF 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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 18164 bytes
SHA-256: 7c2b9f8c30c9d10c1d86ed8beae63661b13a798ba7cb1dccc027eb6798cd38d2
font_01_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 11128 bytes
SHA-256: d488aae9d273f23f3d7fb5091a9db416722a41ce3672638224d52616accb4c01
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1