Malicious PDF — malware analysis report

Static analysis result for SHA-256 889ac96e0817da34…

MALICIOUS

PDF

73.5 KB Created: 2021-09-30 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f168cb9852f17b8a8538861aac9dc22f SHA-1: 66d557ba730c34694b346b23ba4b4d166a71d0f4 SHA-256: 889ac96e0817da34727f6d04e322ecef726ca31ffd44eee34a436fa27197f206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that act as a link farm, directing users to various external websites. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, suggesting a malicious intent to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=android+organisation+apps PDF link annotation
    • https://truonggiangcompany.com/userfiles/file/18297144216.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/mevuweterupipuwixakat.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/liruletixafunaxosogaziwo.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/vategixedonumatilevewumif.pdfIn PDF document text
    • http://dmkert.hu/files/file/74864455240.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/31322028304.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/50117956324.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/72so0qr7hngaed2bciqu4299tp2msum3/35371734986.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16321320223485.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6724806122.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/99927063057.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/kuwiwodofezosimividawaf.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/91553339283.pdfIn PDF document text
    • https://sentralperdana.com/file/34126531819.pdfIn PDF document text
    • http://lejuriste.ru/files/file/22308731347.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8hocus2iihvjj1c7925dqe6jkd/xirizeragu.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/9985457617.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fugawuvisupe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614030ee29417---12684030317.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/1867598710.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/7755055588.pdfIn PDF document text
    • http://www.bash.cl/media/file/lumitoxigukal.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/14617682950.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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 10368 bytes
SHA-256: 9803ee7c06df6b560315e2086abf800ea6cfbd33c4f8fca8986428ba5762b3f1
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 19296 bytes
SHA-256: 407e12c2f874a0d352a9c5dc7e9d86d281af8630337a1f3d9d01a7659997b6d9
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1