Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8ab8c07ab1f1e9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 01:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0535455ffaad9480d1807e7f6e1e9883 SHA-1: cbe9e7aba2689061227ba524ea9fe417318bd1bb SHA-256: ad8ab8c07ab1f1e9737e8cb6d7c2982bab4002383fa00439c2a08fe03a5654fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://casier-a-bouteilles.fr/file/rivajejike.pdf In PDF document text
    • https://npkfertilizerproduction.com/d/files/volid.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/fegejufonavesoruget.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/38944173272.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/firetasoje.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/ranorawowosujufadamuxek.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/dasupasolevalinive.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cae2f75debc5c1938ef52fe37eebaa43/47823515203.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b843f8---neromani.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/74027366417.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd04efb79---66322570103.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/vunosez.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/99428653492.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98455824940.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/99220068578.pdfIn PDF document text
    • https://baptistfriends.org/media/vewuloso.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0bc809f5---sedikataru.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zonokukagorubofiwus.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/rakofudabawaduxijogavub.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57133343709.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/38994342902.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/73985865082.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nataronaxofemem.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/94342810284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=things+fall+apart+chapter+4+pdfPDF 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_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 10820 bytes
SHA-256: ff0aea687de6960749267950c211b37fc72b72082fb2972a69a5c6e555cd4de2
font_02_sfnt_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 18392 bytes
SHA-256: 6872677befce3b34efb589a59877ca56172878472751369b9cfe32b97aee0901

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