Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4f310a74451d9a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 10:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4e09b590fc7e75c31a99dcc89c3f46b SHA-1: 38eec9fc8733b73ed474d8524b0cc188c6022f60 SHA-256: 0f4f310a74451d9ae17c5500cf85a821c85d4cc0434204e963de1433d6664cb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external resources, including compromised WordPress upload storage. The presence of these links suggests the document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.physedu.in/newsite/userfiles/files/kunurepuvosazobidi.pdf In PDF document text
    • http://yas-center.ru/userfiles/file/71792769734.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-11/20210611205529710953.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb803f1bd79---93914561716.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sujamoferej.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/4280013991.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/1df1816e91c61f5de459278a8b6ecd3c/55574231101.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8c8d54736616949388aef297b1a8e19/numosutuzuforadofuner.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/moxixadam.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/r5t326h1pieb5gatq51sinboa6/soviliboju.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8a1d6f567f5ad6a06d1add6f778d4f50/jedenarajowibozemeze.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085147db8e30---dumufapomokujawa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5renh8j234cf622s6e60mrub1p/vozuxewoxumu.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/nuxujun.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f9642ac3f46---xuwonutovuzorukogi.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/wanogapolugogumobugovore.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/65941153148.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/11212030342.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/86215089980.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e188901eaaf785871123415de340bb06/nukizozefomitoma.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/57d31485ed4dfe801efdbf7359aeac23/10363102761.pdfIn PDF document text
    • http://cutskytools.com/d/files/42428213738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=acrobat+extract+pagesPDF 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16372 bytes
SHA-256: 7aa31934b3b93ecbc7b2ced3598db6d9ce230f4d5b16b1c559b08c5e716215ad
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 10532 bytes
SHA-256: 9e208808177d553f7f6f6014b49ab97b25f37de16dcb419d68704961275c8126

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