Malicious PDF — malware analysis report

Static analysis result for SHA-256 275bc4d39488f11c…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 17:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f6a4fe19c31ce525418c3caa17f32e SHA-1: 9125cedb9c95b4dc5df6223d20f38eef466be29f SHA-256: 275bc4d39488f11cada88a50d9b06dede0b6c958764daf274decf92ccc5bd8bf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially harmful content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://clingac.es/d/files/24667629227.pdf In PDF document text
    • http://immobilieninvestors.de/userfiles/file/jelisotorelisimabem.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ef396523598759fda44f8a28dfef929f/niwejilo.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/93883767299.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/87425848020.pdfIn PDF document text
    • http://vitrine-prof.com/files/konefizegotifuduxebodo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/87457a746f9e558add6f9eb0d598929c/14385843843.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/tusatafijusereruduxigewir.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/goxogasesuvibujobog.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/42470480968.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ea96f7d1---bikaranibum.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/sitegiberelebizunelu.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wovisi.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/60956028605.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/66834775288.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340badca8e7---10593881321.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/44686769818.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210910_4581B6A5CD97340B.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/7294970045.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lopigobo.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/51702029116.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/30602674197.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109032337507486.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/palunajuxe.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/3599072952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+13+dbPDF 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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 19628 bytes
SHA-256: 320b605b3cdc5e445e39832029600efdcff0e74cb833baf2758033977f0b9047
font_01_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 9980 bytes
SHA-256: eaa182835b50e055b58e34233d32435ee38e8832a057805902a7c3e8d365d71d
font_02_sfnt_off00013944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1