Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00440a5e099c7ef…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 23:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e1e204af5cec5e463402b49ee3eea96 SHA-1: 9ea87eb806abc820c6544fa638144bdf3c441f45 SHA-256: d00440a5e099c7efb45e082c71ab3f4e109551ceebfe94ddbc9e9ad9acf2df84
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bsa.by/ckfinder/userfiles/files/novujufanaxajakaxojilute.pdf In PDF document text
    • http://metabolit.ru/files/file/95757122770.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/67770520921.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/24260741639.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/ponowaperagizofoxaz.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nexojivimov.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/wusivorigebakasapexaviwux.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/nojumadamobi.pdfIn PDF document text
    • https://avela.md/userfiles/file/3646896310.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/xitezav.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/25333908065.pdfIn PDF document text
    • http://deforma.it/userfiles/files/81897022979.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/96406180913.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/90555091046.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161374e7e18b97---84100921494.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1c75d6a1ccce548865229895e625798a/2904218104.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/lakikalokusoraradisarinu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/33289156692.pdfIn PDF document text
    • http://montesantangelo.it/files/files/81993593552.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/miwevina.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145882c8c8d1---43362793829.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/nanipamoligidigefisadarer.pdfIn PDF document text
    • http://apothepharma.com/upload/files/29072944490.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/11567292692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+nintendo+ds+emulatorPDF 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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 10484 bytes
SHA-256: 1a9815c1b0e802d21f90b7685f9c996fe49df4c3f49e0fb5cc4a480c1ae37abd
font_02_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 18884 bytes
SHA-256: 7c29825d3bef8336a0a3b9b16ba852d2c4f228c851826f4c4c7c08f912041eab