Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93f5ad4e15b92ad…

MALICIOUS

PDF

81.0 KB Created: 2021-10-01 01:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f1705b6ea480f963046d88bbc4c7d8fa SHA-1: 70bb90400a4e720d2e580787986960a07505a758 SHA-256: f93f5ad4e15b92ad3515f0c3c009c541c344c05cd436d8bb837d1eef9a434a8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=live+pron+apk PDF link annotation
    • https://riminabda.sk/userfiles/file/22830481761.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/nofidejejelogenavit.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/96673723476.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/682489611.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376aba5180c---kowitu.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/87725528764.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60f7467c9---lavaxutivas.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/91182790092.pdfIn PDF document text
    • https://podimercrm.com/img/files/36598055703.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/21475726390.pdfIn PDF document text
    • https://onecre.com/images/content/files/13710005262.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/gavibazunifijipazugulu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tep1jlt6ej7sipj1jv9b2fja7f/58794167838.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vogubosi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381aae5e26f---83463728923.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/ferepemep.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/gozukigekikamadakipixubu.pdfIn PDF document text
    • https://architektor.ru/uploads/file/wabonofedupake.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/80616455384.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/zobitajafexes.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3ecc78318---92500658251.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i7816rcuk4pth2p6a640dhb7ch/58410402712.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/46865479421.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109270645147017.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/91103557419.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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 19160 bytes
SHA-256: c4a80224969f59b70fec1fa2cab1102e5ba29abe6c09277717092a9716d85594
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10048 bytes
SHA-256: 114effac051f6a0717e640f8bdcde9ece9068eed3292965fe5ad8a3de6020d13
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1