Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf7e7a26e657d4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-13 10:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a80b95b9129bc067183bc61e3c1027e SHA-1: a45311eb7daea2276cf3fb83c02c15c78d386f28 SHA-256: cedf7e7a26e657d4b614cb437cf3544a41d4598ce52d0d63daec2edbb1a02581
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the classification of this file as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://wedooverseas.com/userfiles/file/26871890744.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c81f186175c044baff0af9fed086672b/66606095932.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/90165983981.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tisesunasu.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/kuvoxomo.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/wanuno.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/fedumixesunujamabiwuzal.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc8a262d4---wegijedinelizos.pdfIn PDF document text
    • https://laser123.com/geektic/files/5893196243.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/bemonabixiba.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/jogusizubagojis.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/63082214751.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/22058898851.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1c403543---23623068384.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/oqfur1mpr5fatu22fobf0qkjlt/91801868265.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/85814161902.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/wolexavodevo.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/fuduzogeforilijo.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/kisujexapegil.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1f313b7a---wukobemugafirozugula.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/13882386575.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zavajes.pdfIn PDF document text
    • http://irinabailey.com/upload/files/60106631229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=paint+to+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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10044 bytes
SHA-256: 02b77392bd0d03d974a33c23f9cd5641840535922cfaeb91a837bafa6872d672
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 17268 bytes
SHA-256: 17bc098eaf4a8210b97fdd02cbff44ee8a6d973e07c79a1469e1bcd441383ced