Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e88e176acb6fc65…

MALICIOUS

PDF

111.4 KB Created: 2021-09-06 15:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e06c8bc050db6cea536da012307fc6aa SHA-1: 4afc292a5775e1b2793a2ac6945bc8d33338377e SHA-256: 7e88e176acb6fc658cf50356823aace704fbddb9db154d8a71dd01fd30e65c62
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other domains, suggesting an attempt to distribute malware or conduct phishing. The presence of numerous external URIs and a link farm heuristic indicates a strong likelihood of redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://industrialdevices.in/uploads/89028069115.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d5168afaa94f87eb79199247c75bbbfd/1062883510.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed6f8d28e---zijanedoli.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sesudaluragi.pdfIn PDF document text
    • http://hongquangled.com/upload/files/zusamofotiwogibuw.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/febuvibinumopukuxazisali.pdfIn PDF document text
    • https://forssh.com/userfiles/file/18715343966.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/48712939998.pdfIn PDF document text
    • http://benrassam.com/uploads/files/73001325235.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/743809055.pdfIn PDF document text
    • http://jpcadonate.com/clients/4/48/4863a0bac697dd4b44f4a1b1fb44835f/File/titerolanazufizoguxiboni.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f344b62880f---31073916795.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbb29bf98---65071912789.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/sajorozax.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/87166722683.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d472ec5e365---vesugopolizufap.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/86617368548.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/qvb5cidi939nt8e92nomgiso83/fogerixoraxawoja.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6e772f5d77ccbc149e6c468c2e82580e/jipuzoguxokoj.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/furasezinilebexipoxofaxa.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/33236430934.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/270337fcfb51faebe8314756d79798ee/levunexojimexoj.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/77805333960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fl+studio+12+reference+manual+pdf+downloadPDF 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_off00014f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F64 11116 bytes
SHA-256: c136801159229578ff97262342ab4d2009f177de63b00e2752c2d5850bb7106b
font_01_sfnt_off00016970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16970 17756 bytes
SHA-256: 92f2f0c10c85d290b8deb675282ad6042ec79d624c3a2676dd373f23d078115b
font_02_sfnt_off0001974d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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