Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f464ff5dca6f0f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 18:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c7214b2d6bf95b434a4653d8e4c999ee SHA-1: 035757eacbcb9f4a88fc2ca2bf50d5b62c0e0d0f SHA-256: e9f464ff5dca6f0f3239598474073ecfb8a6f3ed36d7d4146902f5ae991bc088
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to compromised WordPress sites. These sites host other PDF files, suggesting a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=how+to+sync+contacts+to+email+on+android PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140c930dac51---40642306759.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/tovudoretojazopa.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/44058586488.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/62932983202.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/dofavipatavu.pdfIn PDF document text
    • https://geloracinta.com/contents/files/13172747311.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/28098359546.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907233026.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/63848163207.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7524b0b1---genepepiri.pdfIn PDF document text
    • https://mlspoland.co/files/file/ruzeponodupasi.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/jedapisavilamorew.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/10685245283.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b68bae7d---42142335765.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jubuvege.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/87406341447.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/40525715039.pdfIn PDF document text
    • https://businesslife.com/content/file/xogamozevizapasolo.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/kodiro.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/39888643600.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/marugoregadiwadisepe.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/sapeturib.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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 17476 bytes
SHA-256: 1955359873ba0501d522f6a3015554cd1b546487689ecffc92cd9a114a10d747
font_01_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 10720 bytes
SHA-256: cd24bdcdbfc8f2f53f78688abb9bab580ac7863d914c0a67c9bfcd64b237b0cf