Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2f7fe36815c5e0…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 04:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ce83aba70e8f2e071e70a9a28f79ce6 SHA-1: 65d32c8c01554613dc2addcb66ea8d3f5c610391 SHA-256: 2c2f7fe36815c5e0d75df031608360c039a08510575454113182a5833f6a0dc5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d0cc2604---pawumuzipapakafa.pdf In PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/ruxikuxilemepefik.pdfIn PDF document text
    • http://qca.ch/userfiles/file/24831106901.pdfIn PDF document text
    • http://offerparts.com/upload/files/zonusokanadodaj.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/36b83513a110149d369657fc150e813d/nudemakus.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516115526907585.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/kasevekosikapu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672b8076c2---2177908454.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/eb47b45770c6f829487764cafa503a4c/xibiluzokewekozemej.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/1470874819.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/51501363299.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/zupofebe.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc05c4e945---fevewulubowanasobemoz.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/sedukudukub.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/95715565983.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/78edf738716fde8c58125dfdc754b047/23281414554.pdfIn PDF document text
    • http://stevis.cz/files/file/dogedugekevuvuwofu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/negirojimemafojuromisen.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/bobotowawoxawodov.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/82489619487.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/zebuxodosab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=airforce+x+group+previous+year+paper+pdf+in+englishPDF 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_off0000b8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 11164 bytes
SHA-256: b6864a65e3d86467c21970c56b7ec5af08c498972965244803baef07a8c10882
font_01_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 16492 bytes
SHA-256: 966feb4c5c89202dec09d1737c70b6758035980f48a54b2901cc78ed11108fcd
font_02_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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