Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c9008f097e8c3f…

MALICIOUS

PDF

87.3 KB Created: 2021-08-21 16:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06a71ed6d99343a8c52db0e5e2e5c73f SHA-1: a32b74ebb3e37cd7ad7f2e5881f03658a98b32eb SHA-256: 86c9008f097e8c3f03487172cd7cdfe57ccb9a457586d5cc48c433acd11fe16e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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 https://invest.pl/userfiles/file/14369558896.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fefukowenewixezilu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/40290221232.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/39339239418.pdfIn PDF document text
    • http://klpa.net/userData/board/file/21277750738.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/8745974251.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/dufejifazoregumabeboxewe.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/22179381565.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8edranlfng8e17uj0rd51jpl92/niveju.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/pikulezonewate.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac7da993f---xesod.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/83403983827.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/vetamajad.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gavokuvizakukezizikipi.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607939837604b---4203711836.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/91368866d7e992b97a0d5f364a126ac4/9586975059.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5821027519.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946600cad58---91485807101.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210724233743.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/21268454753.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3ede8069e075636ccf3ac09deb34eda4/30722350309.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e3bb4defd711847720cfa93acf52b507/44913200518.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/rodinufazigedimo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gudidirutej.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/5a9f7c8b68319583b522c9a44818cc6e/22664940249.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/80a16449497930f667d90079d76db582/46541259579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+use+google+play+store+on+chromebookPDF 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_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 17032 bytes
SHA-256: 2e3be0698fe7f76969f55cd285862824907cb488226a720c82d45b8dbf6e00ff
font_01_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 11208 bytes
SHA-256: 82e92d79a5b8e110638b1e50d3d13c33db15697fb7925453b92ba9e29ace7981
font_02_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1