Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a9cc5608fdb392…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 22:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b7e2048724d9a18adc3be2d8b65f5a7 SHA-1: b648954f151a64093bfacef3e2832b9b40e0a57e SHA-256: c3a9cc5608fdb392b3e6aa5838609c261b46d795d15698c145a06b16bdb31984
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coumert.com/images/file/83728597220.pdf In PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090302034420.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/gakipu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/67050742671.pdfIn PDF document text
    • https://ocw.tw/uploads/files/53662141927.pdfIn PDF document text
    • http://husplaza.hu/editor_up/21669137652.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/dejazasirimed.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gabawe.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/nalevevulebovizejipezi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/tezivev.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80255db38---genitapezuturopag.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/21368225395.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/kerapimubenikunorabip.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xeruwil.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/mapigazumag.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bikugonawuzor.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dekunodavojafapesefavag.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/10565198283.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/aid31k7p77b7urc8ssams0aht7/nuvagewaxiji.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f4c1254c---gurabamorafeso.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/29181393623.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/vekiwimubenemazizadiz.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/78941314575.pdfIn PDF document text
    • http://lukinserv.hu/file/99475209725.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/kitisirazofibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=slime+rancher+download+para+celularPDF 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_off0000c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10772 bytes
SHA-256: 55eee2ef3d3419b415f7dfb4aa708ec473454070e88ab3f747f38afced45e8e9
font_02_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 17248 bytes
SHA-256: 57c89b74951f986cb246282975890ddf104fca573afd5c4b3c36bccb72a10845

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