Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd680feddd789c32…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 04:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32ff5d1b874d9ce17061953ae0f2fd61 SHA-1: a5f16da96ea90d79fbea624a1811da38b1006b82 SHA-256: bd680feddd789c320868d385d69c7c5df5f74960d517c1ea55c870ed0eb5f461
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to exploit users through deceptive redirection, likely as a precursor to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://taichielite.com/louis/taichi/ckfinder/userfiles/files/tizorotazugodenitidavezo.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a199b2819ef9d45478b5ace527620403/lubewodefowajuxakevawutig.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b0c390c05---76837484401.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9b01f7501b406c7929431bad794b9092/66385356134.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/tojetafomanexapijikud.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c64d72113---18280399666.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/25157632180.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce15a7d262---nuzosuvar.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/78846922179.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/kenixesenuxobanu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nanukuvosaripiweme.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f53f97f09a7---kupisasuturapefiwewigeril.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/zirarip.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/webetolixapanexaperegoba.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210814203537.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/92871169622.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vazupunikus.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/fuxusibazuvesapugiseve.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a65099573717e310a32895a5ab21cab2/22878368924.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd10997a8---10094536959.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/86042157906.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/linulijezu.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/divalidabuboxamamegoga.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zesekofusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hotel+industry+in+ghana+pdfPDF 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_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10980 bytes
SHA-256: d8c815b442edea278f1911ac15bf85199267a3b277cbeba2fb1cdf0003205aba
font_02_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 18372 bytes
SHA-256: 80cd2140ab4de2e0e6569a5bc1e8fb34e191aff6f975c57356bacfecf2f2e050

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