Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1da89b8942cc55…

MALICIOUS

PDF

80.2 KB Created: 2021-07-31 22:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49f9a3e0e842501286013eadf71ed9cb SHA-1: 101e72793896eebad41db6df945c5f3c964bd9c2 SHA-256: 4e1da89b8942cc553c34d7c9b5a1288361702b98726d83094607f82d4f53b945
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS uploads. This suggests an attempt to lure users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medica-eg.com/userfiles/file/sajemabenarosilovaruzop.pdf In PDF document text
    • https://renetravel.ro/images/files/tipuxijemadigesikozefujas.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e058887e44---dabonufezaxedufojebiz.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/mupoteleniz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b2fab7b5f10e2180148be28b3821f2f4/11570235112.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/r3trqeb7blm4hrcg0hsiccspq5/sorogi.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/muwumuvowexe.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/pudefewebujuwizazajulos.pdfIn PDF document text
    • https://brod-plovdiv.com/images/vedolibusavek.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93bd1d1a2---bunaneberatip.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2b8f1c89---pokonojurekonadodademuxud.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kunulapoge.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/63883633826.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/79929518544.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mrhcjouls9qtu6a27pcsaj17j7/fosefakoxadojajidewafo.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/birorif.pdfIn PDF document text
    • https://menu2uplus.com/images/file/15571093336.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/83379676083.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210723_044714.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/jabepazebusaserosov.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210716041618000817xxhup0ekcwcg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+apply+lina+uv+gelPDF 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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 16000 bytes
SHA-256: 9dee9a0836371156d530cd6e15f3b08e30c32e44a1d3cb4143e5a932c7e2f147
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10516 bytes
SHA-256: 2f366d8bfb16a4f8a4048b7373f11b8548e985611ac6954d2291a9411154b4a1