Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c6488943408663…

MALICIOUS

PDF

71.4 KB Created: 2021-09-22 15:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 944136d988d160f3e10ee7ce38db7d7e SHA-1: 55c4abdc7a9171b74d95abc7c9c0b2cf88703ca4 SHA-256: b7c6488943408663b5f5581dead0c111da20c380645a099b3f72afe78898a2ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://www.peltonfell.org.uk/ckfinder/userfiles/files/pewomokal.pdf In PDF document text
    • http://reicar.dk/userfiles/file/3745487651.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210915093242.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/lulawekaraminira.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/12338737647.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8h28pa4ft71r8h7f5u32745sm6/53569006558.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/9071933578.pdfIn PDF document text
    • http://parateam.cz/file/lofajegubebeniw.pdfIn PDF document text
    • http://centronegozi.com/public/71952474292.pdfIn PDF document text
    • https://deepex.hu/hirek/files/75581088184.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/vijazegibozegenamazepel.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/81528108797.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/javulepavabixi.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/66043431187.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/86704330243.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/29071191469.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aceb0c8f9705d7fb71306bfc61d68fa2/11552730063.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/65104162408.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/21505795684.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89882535240.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a98311f7d9b76d2607c1d307655060af/wimavixudiw.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/34014544111.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23202859792.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/64691709847.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/3390209637.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/73109172554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ver+pelicula+online+the+croods+2PDF 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_off0000b707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB707 10800 bytes
SHA-256: 15519553c127f2d4939574a58bc5eee4b3f99c53597899436967c5053f1615bf
font_01_sfnt_off0000cfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 15864 bytes
SHA-256: f04b2df8b83151b0d945783188f1eb9694994da3d02abda60da044e038b3177c
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1