Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8360b99cb24db54…

MALICIOUS

PDF

83.5 KB Created: 2021-07-27 00:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16bb25883a28f38d5b55a8455d6a2c34 SHA-1: 35d0432ed85e7a2b9454971c72a8fa3b09c5b55d SHA-256: a8360b99cb24db548e54a95370956b33e7e72e41c099fd5e9014a9d2f60bba97
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for malicious purposes. 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 consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zamokugrofa.sk/admin/fckeditor/file/55720590074.pdf In PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/19963943740.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160757055c53d5---kupafitajujekawu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/37283108824.pdfIn PDF document text
    • https://kuepancong.com/contents//files/69386725959.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171dcdc97f---xifozen.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/52370005596.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/kesipijibu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9197e395ae---rokabiroloviwo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0708232262---78590866694.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0f906932e1ade2741429b2d9501b1e8c/libajanogus.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/37511913900.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bugudamolewax.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/zewigujuwirobop.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/27195991539.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/vexadokabolo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c81aef7c---soledisitotogasisoxaz.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jupupa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0552796df2---kegulodenevawalore.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/286010885.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3d3beec41dc5e1216f5d435706e62c4b/37584967270.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be71e0e506b---96427591954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=congruent+figures+are+similar+true+or+falsePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_01_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10688 bytes
SHA-256: 27b674dcb064a975cead2b5cf1d66201ad6aeeafd0edb1875670459b7ec7242b
font_03_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 17940 bytes
SHA-256: 4aa51ec49ab6e45cda0a09ae39aaff6b41e4cd017537a6a106363eb79adc91ef

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