Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd3e1f3d597b6ad…

MALICIOUS

PDF

82.8 KB Created: 2021-09-11 19:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e48f1359bc784655064c7146f9e50800 SHA-1: 082ac93c9793027f049a0e45a3ac178874b14923 SHA-256: 0dd3e1f3d597b6ad96be2df1031218bdaf39db00227faf10ab8b207a192f6eb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chromavials.com/d/files/27973961250.pdf In PDF document text
    • https://cardion.dk/gfx/fckimages/file/porewimo.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/92191843360.pdfIn PDF document text
    • http://llux.vn/uploads/files/zebanagi.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/towevenazonaz.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/90140329278.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bomilamirex.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/xerokuzo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0a362b96---65924820372.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f45764c4---wefezu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132247b1a80b---lojazifipijikezotapurixe.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tojotepezotulegegivagiguk.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/83433756918.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/relunevoku.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/mexevidagusega.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/88053014764.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a31f3680---43314449085.pdfIn PDF document text
    • https://laps.pl/userfiles/file/karulobegik.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vaxinubixawi.pdfIn PDF document text
    • https://heyratacademy.ir/file/sobodovevuferovubiwupifa.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/lixemixa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56103747046.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae1565c539---70384613613.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • https://sambelteri.com/contents/files/luwoxali.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/wopudizabekadesitapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=extreme+car+driving+simulator+hack+mod+apk+new+versionPDF 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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 16940 bytes
SHA-256: ca6a87f2c7502326b917bc2171eb2fd7d3c06d4ebfce4ba71da1e88c8e120bbf
font_01_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 11388 bytes
SHA-256: b12c6300d77845d58f0972320754e6bdc12c2a5d1e25b51b10045de623983396
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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