Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb54d50eb7d94322…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 15:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd8415fb54908bbc2a92f0a440ca0e0a SHA-1: 1808489b4ae427cafe38eaeb2ccc1e58fbe3ab60 SHA-256: eb54d50eb7d94322a0fb4b2501a56cf01c83ca7e289c5efda653476c9ab71d6d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://mtjjt.com/2013/upload/article/files/210913151929891153ebhan.pdf In PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/vudijebenubibaxikuga.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/11432809966.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161324e07a42d5---12208237577.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/41713188685.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/82628680748.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/87513116405.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wexexevipitudarixabisir.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/7360382740.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wovonebenemunegonafar.pdfIn PDF document text
    • https://majubesar.net/contents/files/95249717527.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab1b8cce3c63f5dd9e82d57bc45a6a2f/70556381750.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/81605433498.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuwujat.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tolijovem.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210913141036143.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/24980339736.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9b32684ccbc2044f9af145303fd92ffb/44529439023.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/zotefidaxejevilekuzuxuji.pdfIn PDF document text
    • http://pi-consulting.ch/download/mosarobif.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/sevogofoni.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/88540758730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=windows+pc+apkPDF 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_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 10300 bytes
SHA-256: bf458caf10a1c7c0fe55651b9254be7001fc53a444f704659a0747e3b2577926
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 18592 bytes
SHA-256: 0e5b369af0c32dbe8407a9dc5e91dc5f730f4c6529906779f2d4dcd160fe2ff7