Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2c0402c81bb8dc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d053c6dce9c11c25cc858a8da9e8f7c3 SHA-1: 809c6293ee745b70899e1f627f2280e89695f939 SHA-256: 8b2c0402c81bb8dc309ee3596999806cf97b5367f4be4388861b6a8636655a26
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to further malicious content or phishing attempts.

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://www.terresdescaraibes.fr/file/jijagakizugiwikemed.pdf In PDF document text
    • https://taperagi.com/contents/files/72538085732.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42f8d1168---4003209771.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/levuzixosalejadim.pdfIn PDF document text
    • http://rayer.cn/d/files/3191530010.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/99428868379.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/gufipomopanimuwufef.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/posusizobavenizabano.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/fozek.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/37397926513.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/23047499683.pdfIn PDF document text
    • https://ferropula.hr/files/61977417965.pdfIn PDF document text
    • http://zzquansu.cn/d/files/mulidetatujomero.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3dab6181c---35204978668.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/xejefexotizezojafokipuf.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/3405375078.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea42ecc48---64581724351.pdfIn PDF document text
    • http://netflor.pl/upload/File/gexikeluvikaruzogot.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/laliwiput.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vuwulirawed.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/novamezanebutuxoxoz.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/woduxuvawarunibatakaze.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/36137132342.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/matodipepumaponik.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db3dc557771948d0ec20bf3fedc89af3/banivobujigowowos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=atomic+radius+fePDF 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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 17080 bytes
SHA-256: 01e4b300cb7c30adecb8bbae6c622e6460274131b4742fb803b5b2f16954f06d
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 10568 bytes
SHA-256: 31162f522231a51c230f8d7c18cb3d3d2da94a527e73a03ae6ad573940b7f332