Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b67a647bba3fe2f…

MALICIOUS

PDF

76.8 KB Created: 2021-08-14 09:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5147b80241413787e6bb32bef6194d68 SHA-1: 8148d63f5783c9c871c9bec9e6aa298c189af8c4 SHA-256: 2b67a647bba3fe2f15433a82b801f3261b9ef48f910e04f7ac59fa0f8ae6c8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which host other PDFs. Several heuristics indicate these links are associated with compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fcraregistration.com/UploadedData/file/benijupa.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0a6c3c4d---runuxamuxawivajotik.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/6152976235.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1b4e83f5---vixitaredolixakaketu.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210807165632.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7d5d9004586ce865460bb98cfd68639c/tidakezevumemakeje.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48b279333f---sizadoz.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/14241255390.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/14086335824.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/99279199528.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afcae1dab6f---gariguvomijitaradolulovu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086daac886ca---loxisunibez.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/6983975738.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca15a984493---tobinogalag.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075b75eefb26---46680071779.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/42911788328.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761fcfb9e6e---41290235610.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fimosonupepetanajoga.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/56185262394.pdfIn PDF document text
    • http://winso.tw/userfiles/file/muzinilodudukolofawej.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/22698399524.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nagusowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+san+andreas+tsunami+mod+downloadPDF 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_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 16636 bytes
SHA-256: eb2ae78352e0f2b26b0a0516e1b4d27fb3eefaa2b08a201786d8e3b91f40c421
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10636 bytes
SHA-256: 48f1f9ae2d075b92a7781615f4d4e11fff4f0545d1b788f9b69fd22d1eca2f13

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