Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a1e92909cad40f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 04:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85836275bfb053022ca20f3765d52f41 SHA-1: 9fde0c4317ad47f9e55d37cb0d287c0dd4fbbb47 SHA-256: 25a1e92909cad40f4df427725a74fa3158a512bbd949ad9dcc5ae5f5a991cacd
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links, many pointing to compromised or disposable hosting. The heuristics indicate it's a lure for MFA or one-time code harvesting, consistent with credential phishing. The embedded JavaScript likely facilitates the redirection or obfuscation of malicious links, contributing to the overall phishing and potential malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://ketchas.ru/uplcv?utm_term=applock+pattern+forgot PDF link annotation
    • http://umbabox.com/userfiles/file/padadowitoxifutopume.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011254476998.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c8dd89ef---13824745588.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/41187541000.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/20577007989.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/11352797707.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/27429320188.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/pejesokinepuzikavowibe.pdfIn PDF document text
    • http://jsdarvin.com/files/safanufubifu.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6de995e0---29169990170.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/5444277472.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/54026871923.pdfIn PDF document text
    • http://altinay-law.com/images/file/14356859900.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/pizudajidufumidumeri.pdfIn PDF document text
    • http://ymmicro.com/files/files/rabolizezaromomafipi.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pegowar.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lomagonenogifes.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/43123077524.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pemilesi.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/94158db9799599ebaadae18f90662eb9/18015221157.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e694f16d3b41c001fe09c8f9b3af10b6/27610373704.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/zirawa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/20609113a5203f06f45981fec1ea8beb/narutewepewemogalo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/57039081561.pdfIn PDF document text
    • 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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17720 bytes
SHA-256: 93e40b8151fae4573e01c7bf8fbed4c06fc74b8bb2171aedda2aa70d2846766c
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10468 bytes
SHA-256: 64e50b1ea5cafe6b17b0bf26047890cc58739bbd5bb6edd64ffc13ba4855e5dd

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