Malicious PDF — malware analysis report

Static analysis result for SHA-256 9520c4728ca19a4e…

MALICIOUS

PDF

75.9 KB Created: 2021-09-08 01:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bc26a09d195797df5a55fc23c77bd4e SHA-1: 29beae8b17c8be782b49e6842aa2ee9a5b2d4a03 SHA-256: 9520c4728ca19a4e35394d71444d163949767952b8a0e513cecb5f783ad74a07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://aarogyamedico.com/userfiles/file/98306208029.pdf In PDF document text
    • http://shinaval.ru/userfiles/file/4528778774.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19e060c494---64434200560.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b157db61c9---parelexaz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/vezejawi.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/90780746140.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kojakulugozutijudid.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/rekoxavamafad.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/72497192527.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/98568495872.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb2afbf030---lanumipapober.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q54stb2buf8lccpsjj4hmamqd1/luzorifunip.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/vepadotama.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/43242794681.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/pesizab.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/6138711674.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d006834a---87492798943.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/66702872424.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/voxexuru.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/zodupatekupawado.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac698a23b57---runob.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f0e2hrh3os969hu3e07c3jtgq2/36092639966.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/milizadab.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/e5jtc7061nji20ihb66mpmkk0e/21220290055.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/99859887162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=frommer%27s+japan+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_off0000bfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 18896 bytes
SHA-256: 2d3f33e33a31422903c74c0d8970086b0682d0e04c1ab64880aa141586f79ef8
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 10564 bytes
SHA-256: 8e8ddbf4add7e6f0460b236a55594fc3e76032c2ad90b1c1297ff6cdaae870db