Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82a110bcafabd7c…

MALICIOUS

PDF

92.8 KB Created: 2021-09-16 11:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 142967b8430057c4ec934d8ec9ee66ef SHA-1: fafec4646b17a1abda068ceff94c5f196b04a3cb SHA-256: d82a110bcafabd7ce4325ee784af9f467e5dbc58c2dc1d31183b09b589ecd72e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially disposable or compromised domains. The embedded URLs suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=valmiki+ramayanam+tamil+pdf PDF link annotation
    • http://ciskmv.com/css/file/tiruvizifurutororazawo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324341c7e8e---71864678567.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/11302473643.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21035730348.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/49219208432.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zuvejoxiboxakiwukop.pdfIn PDF document text
    • http://mariancozma.com/_user/file/tusikebudusepopimolirofaf.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2b8aeba---jakadexejigavarexinuj.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/gilobupisa.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/36100148299.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/28157951894.pdfIn PDF document text
    • http://cartopack.com/Images/file/ruvinamalikor.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c8ba75bd7f01d9dd548ee8824d90d5a9/joletotomoka.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/16746634271.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/13004302194.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/fusem.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdadee29e---28736135281.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tebixezunalezudazit.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/vikazu.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fubikameganofaselal.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/81416420340.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/32422469729.pdfIn PDF document text
    • http://vecsecity.info/editor_up/tavexepigikugewonuwag.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wujewatifavubizosuxima.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc77c4686d---kubasogetekan.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914152336.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/15636276332.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_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 10412 bytes
SHA-256: 7e7a54f6c270dd55468d72e7c0e080428b590a69f299717df08896d0c747cdb4
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 20100 bytes
SHA-256: 2857e53dfdd868017e2374d322c22224152fb90332b6020ec13ee1e8c77104b1
font_02_sfnt_off00014d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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