Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f10c5d7064bf16…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 19:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11cbcdebe31568b0de968ba34e39e978 SHA-1: 981b0cef954657bbfd2c0f87d84fb316f5b50ebb SHA-256: 02f10c5d7064bf168b7f1d43b53fe54be9c4600a035e4ea61a7ca779c2847b54
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kientrucqhouse.com/uploads/image/files/gakudosozupax.pdf In PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210906/file/88041290634.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/19354870902.pdfIn PDF document text
    • https://glozor.com/userfiles/file/xipazuvubiwelivip.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161362cfce40dd---velar.pdfIn PDF document text
    • http://laserinnsbruck.com/static/73511540363.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jufiv.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305d8812c58---lozovawotisajodakosidub.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/tugejutegaz.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/buramezubobemaj.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/wewolezilipadi.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395404406c3---sosodidedogik.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/86942386268.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090605570314.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f178fd6d31---gepoxopanibobuzukas.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/punegep.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/fimeruriz.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/75280077752.pdfIn PDF document text
    • https://svltv.in/userfiles/files/rowifazo.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109131430042378150vgw0.pdfIn PDF document text
    • http://sakem.org/userfiles/files/jomiwubaw.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/13210883147.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/20559354162.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/99970390769.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/tibuxobewop.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/64411585908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=come+cambiare+icone+su+androidPDF 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_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10656 bytes
SHA-256: 529f414deb453487ca805fb63f19a58213c2f25092c164c3482f47a499f819ec
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 17520 bytes
SHA-256: 1025d60633555f156f7ea093a013ac41b56c4601f2c7f5208efdb82e1e691560

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