Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f5c8372b17e037…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 20:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4acd3a8dacf8d5ca0982db018d68d174 SHA-1: a16bb401b2eccb7e7404df5b9a66f86a2b197e38 SHA-256: 66f5c8372b17e037dd00dde248acd5449b298051b1a310ab4e62902ef84b1c80
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is unreadable binary data, indicating it likely exploits a PDF vulnerability to execute code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://huntic.ru/uplcv?utm_term=free+mpre+practice+questions+and+answers PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f026da86---21808486181.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b09d5fc1506---bofasarusa.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/72825407803.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/66378104881.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/fowukifovavim.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7d0bef14b4e2542974f213f6ecfcd0e5/wofodesuligan.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a35669d72---bokanel.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c977989b1829dd9b78255914e36877c6/68273094254.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/487fa2d960085f5ffd447191a4a739a8/patofizunizujeluraredapel.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/gojuwopumusodux.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/35280298064.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78885340768.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/e9kg4f2mf6nu1kag7eofk961tv/jegopupuzufogez.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/lonekogakunofuzevorabadin.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ic8o2r4s1ja3hmur1ugni9m042/nenumuvew.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o7akmlpbcdvu3k275m9fqs6704/setexajakevazunakarokon.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/vofemezekifusadawanibow.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/kigekigukovibema.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bcmqopmdvtgtgkcme5pm5160q2/wepejizutifozu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/r24fovdhf52sqtjanjhq5jm74h/31765141771.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/f9bvcr7k9u8dcob93dp59e3for/bujakuto.pdfIn PDF document text
    • https://airshow-bg.com/file/63284167362.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_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 17608 bytes
SHA-256: c54d370423633f7a40e5af4bebfb9e824030948f6006bcbed339c4ef89bd355a
font_01_sfnt_off000153fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FB 10940 bytes
SHA-256: b0fc53bc648f6a26d6890c09bcc5748cc1e4d01815872a75b69b7be8bcc07134
font_02_sfnt_off00016d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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