Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0c3a5cddbd88a9…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 07:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d3427344421d6b12821d02fcd5a1b84 SHA-1: fbe1aa7328efa6d5390c54579c4e8f72d9844c9a SHA-256: 3d0c3a5cddbd88a959ff7b4d6531e8b000cb46f05a50e79fd8b0cb718819833c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the presence of a link farm pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://leebyunghun.org/new/upload/board/files/63701886808.pdf In PDF document text
    • http://challendor.com/fckeditor/upload/file/kabavinuwerib.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/nikawakutega.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/59030294345.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/58062363425.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141379f71998---vipimirulopojar.pdfIn PDF document text
    • https://tierlistei.ch/downloads/66499254688.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/vatepanaja.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/belesinatuta.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vosavelelekotiba.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/76853724077.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5eae9fbb9---65698587309.pdfIn PDF document text
    • http://tai-group.com/upload/files/77660404945.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/wokeb.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613627994875c---53120120633.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/ponakafapa.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/zejazi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87883232477.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130847725364---xabarezefeniludob.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/25066697057.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c66c9bc43682a5b275bf6a99ea7563ad/vudozok.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/69713517032.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/miragirojif.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/12208152543.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/zepolimaguxomimikavexaxe.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/suviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=conditional+1+exercises+pdfPDF 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_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 10800 bytes
SHA-256: 5f1aa8d045fe3b44a98462f60004e372a0bd9c9f15336a52d65fd73dfc41ff91
font_01_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 16772 bytes
SHA-256: 734f602310812cd0324155e39e548a93585105fbe25c4ef80571ce76a47102a2
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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