Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c83c5a9c559d57…

MALICIOUS

PDF

105.6 KB Created: 2021-09-05 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1128cd981ff0aa0d470c4c791feb9632 SHA-1: 26d8e680463db7f9ca31f1f732c8a015e5a86b30 SHA-256: c9c83c5a9c559d57b92b6a8649e28257130d74b2183e25759a34f1d2a9861076
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://taeguektour.com/FileData/ckfinder/files/20210531_133E853E2ACCDE00.pdf In PDF document text
    • http://jjinline.org/file_upload/file/97113443041.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/77056872273.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8478718ff---13674679999.pdfIn PDF document text
    • http://riversedgefm.com/files/file/53921025651.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/324276176.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/58535811932.pdfIn PDF document text
    • https://badrivishal.com/media/44147924371.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/jatojodifavuvujidawisopuv.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/259e550a2f3958871c53b6582bc6903c/55702893151.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/21386493131.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/sukebenizumapigixusenekaz.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/punemubonakusizedarekun.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062600003570554.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2og8cvmp33bi5kiscaed3u176o/57316357462.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/3977616203.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/87979763405.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/77903211280.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/abfdc2c0863431ac8c56d3e80dcf79ba/80000576858.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-5/20210805174540956586.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/61965909961.pdfIn PDF document text
    • https://servicepapik.ro/files/7314597117.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/71805841443.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/fuzefirulu.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/xitofama.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/5886853565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fahaman+liberalisme+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_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F9 20648 bytes
SHA-256: a9dd67c5f7e6d7632a5f306c29263323955410d31964fe56a5c984502c104192
font_02_sfnt_off000180d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180D1 10664 bytes
SHA-256: d8b46d7304b4483868603b7bea349f591b68bbb5ce0f9a88d6c858c621818bdb