Malicious PDF — malware analysis report

Static analysis result for SHA-256 8379888a974f08f8…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 22:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 191563619b1487a53257c8b0cf0e0cf2 SHA-1: 92293de86572a6fe531fbb0e37e8cd4270656be6 SHA-256: 8379888a974f08f8b5a8ceafda4b6fc786413f02ed59917728da836518fcd1e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://giasuthienphuc.com/Images_upload/files/6109989005.pdf In PDF document text
    • http://oaklandscreche.ie/userfiles/files/27385534894.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4582993ba2a0fc9d67f940d8de65347f/85836928021.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/xudegutebuziwekuwujemolir.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/gepobiripumideremef.pdfIn PDF document text
    • http://ipceurope.com/assets/file/vufaxazepa.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/wepagoroxovumewixar.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/42599859667.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11272441271.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/zulujobidakikolafadi.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/raraxinaxig.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xamudinejofisuzodato.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/xogadosijagifelif.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d0d43c7977e01b91692d376a95ac96d5/gogiko.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210907/files/20210907143527.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161319c1f696c1---benujabudepafabifej.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/92474068928.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80db2adf3---xipazemidilesafevigoxopow.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abd4e9acd---36235539169.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/kisip.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kikidora.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/suwunovefefimatemer.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pebenedemarobaxewem.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rowevoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=milk+and+honey+book+pdfPDF 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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 17936 bytes
SHA-256: 8c87aca685661d489d24a493ae2e1602753afc0c787c6f978bdec99f1bbca4e0
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10568 bytes
SHA-256: 4d5567e01cae4bacbff34baf8fc14c1c42f20825b3396b33f5a199849608c2da
font_02_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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