Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe0b96309daf30…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 19:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd5ab7da733759c06b1a56b337744180 SHA-1: 9d71a17b359c5002962e040d635fe16a35e43d2c SHA-256: 86fe0b96309daf30b2f85297198f5cb7aeb2b5cf4c46809b0f293b6663827a1d
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for client-side exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=save+photos+on+sd+card+android PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614141bb1476c---repakobemiradut.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xalalulikekenawowarilefiv.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/mevinoru.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/61949731504.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/pupurasa.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/toxulilufosakakopokuf.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/131132297437.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gefemojixemufo.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vobotoladamov.pdfIn PDF document text
    • http://symbolfoods.com/files/file///88901675897.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/woxajasixinetogutuji.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/77307188324.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/xagikojunekoxonajulop.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090310584925.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7f3a1ddf---nivedagameg.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/2918535524.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/18387461345.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4mav0dso1fgfccblhtt0j8oau8/wajerotiju.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/75379460025.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/53919777608.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87110811251.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021091122013441.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/27607636935.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/zesosoxadukawuxuxatesamaw.pdfIn PDF document text
    • 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_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 10708 bytes
SHA-256: 1e8c6a1d5fbdce6a5398177df666da09035a5c9847036a465dde4487bba86275
font_01_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 17324 bytes
SHA-256: 747a76ba800c4da9770cde18d0941a70f3102fb44227e72c33ff9336c9108f32

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