Malicious PDF — malware analysis report

Static analysis result for SHA-256 badc38ecfebe0b3b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 05:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b01ac1b2d839934b7cea546a7829fe8 SHA-1: 0736f795464cd663642d127a454e75514279397e SHA-256: badc38ecfebe0b3b2d81fc75358038ad5c7741fb32c9b7b211a40718bf151a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7ffnjqlig990eo6rk9hb9pa3s2/13955693903.pdf In PDF document text
    • http://liburnia.pl/userfiles/file/woxipoguvaposokagasaj.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc9978cdc---rexopol.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/pufetuvufutonotamepuxige.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc07879c9d---fozefuwotasuxiniwaf.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/wofigofuv.pdfIn PDF document text
    • https://italvaping.com/file/nuxinaf.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/semopotoregagatubejan.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3ed0f312f---3336981210.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d929eca821---gegelelevekanubid.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/44082187567.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/83bbb12cd06519fa2fa7916661f093fa/43374989426.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/29807818749.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/t8798pssged41ou8im6vsi9o70/81879259401.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/ninalurobe.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/pudenu.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/14057779151.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d60e53db203---46485845046.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d39216bb798---43667136345.pdfIn PDF document text
    • http://dc-28460bd9dc5f.liebes-map.ch/ckfinder/userfiles/files/78738004202.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/43584684440.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/28356891504.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c34c0aa5---bedosafiniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=constitutional+and+political+history+of+pakistan+by+hamid+khan+latest+editionPDF 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_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 16756 bytes
SHA-256: afe5e67b2ba840198de7478028f9b442e01999501ab6d3e42a7b128273f9764d
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11364 bytes
SHA-256: aeac04952fd29c340e7187b627549b3b35f23bc9372b7c3b1b36e947285dbfc5
font_02_sfnt_off00011a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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