Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e87fa0fabaccacf…

MALICIOUS

PDF

116.3 KB Created: 2021-07-30 03:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d8e33b9d2c9b37315bda98fcf202d69 SHA-1: 764a5016bf733e6dff2c718a4425091ad9302c87 SHA-256: 7e87fa0fabaccacf742607f6d47421dc9aac6aad6e8027f4d598deb1e5da7036
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and link farms indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://studiopol.it/userfiles/files/93355513700.pdf In PDF document text
    • http://erex.hu/upload/file/rurijubuwoxupuso.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/febofebenomorapu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q4ijkvngim70m4qc1iu7cic9l0/bipexibupegef.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13e5caa41---15463579136.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ni00a6h20tsqceasa6prmpj0ih/6074353429.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d3304b05---wefodigofin.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16096066b7113e---lokurizunipudufozi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e980ae7c2ab---zabadibunasuxawugotiv.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/67133453906.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/45ac5689af53aae9a4d25095bf255eab/40294472507.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8891ec709a---ronuxisoxagurobafo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d0fa91dd8---mebuju.pdfIn PDF document text
    • http://northcity.rs/slike/files/dudiro.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/juzuj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39ef10cf3---nukunoraseburafuwin.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nidiserubupasaxirabab.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160814bad3d5b9---42237608647.pdfIn PDF document text
    • https://dcimx.com/files/10492211977.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/8483913393.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/98297603125.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f3cb9d8f---48508151069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=%D9%85%D8%AA%D8%AC%D8%B1+%D8%A7%D9%84%D8%AD%D8%B1%D9%81+%D8%A7%D9%84%D9%8A%D8%AF%D9%88%D9%8A%D8%A9+%D9%81%D9%8A+%D8%A8%D8%B1%D9%88%D9%83%D9%84%D9%8A%D9%86+%D9%86%D9%8A%D9%88%D9%8A%D9%88%D8%B1%D9%83PDF 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_off00015d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D68 18192 bytes
SHA-256: b478ae81128b636911a00e6ae7454f46c6c3c68a196b8c0c1a4e6052a9c4156b
font_01_sfnt_off00018d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 8984 bytes
SHA-256: 1155eef8b03fb48db8196c62fe92ea0367c3129ef5e52290f3da045cb9446085
font_02_sfnt_off00019f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F93 19604 bytes
SHA-256: 7df74a2cc0d19f143e77c8e6dbe8cd0f9e9fcb2dce610a723d757267c9b6a416

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