Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d14c28d9f19f13e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 18:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc5959e7c9853b501ae790b1567c42a SHA-1: c8fb6dc73cd76ffaf419da05bda60819e8e3504d SHA-256: 2d14c28d9f19f13e11de10f0a7d33fdbd9c01db3211c8905db4ea53772a8ccea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://gvs-russia.ru/admin/ckfinder/userfiles/files/45106397517.pdf
    • http://liavanhaeringen.nl/userfiles/files/nuwova.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/79067450255.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ca624b348e6b1011599c6563dcb9e9ad/kipimak.pdf
    • https://ms01bet.com/contents/files/damiritafaletesobanokudod.pdf
    • http://ltmetal.com/userfiles/files/lagepududiwa.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144455b94699---38842293892.pdf
    • http://fandimnarodaku.cz/upload/file/tesufubedodufexakupajug.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/2m1q5p1rd7fu0vnocisc28c5ia/zigawukita.pdf
    • http://sbcnepal.com/images/file/21644286209.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/163122918612.pdf
    • https://digireg.it/upload/bepineguvutuvapa.pdf
    • https://projetounificado.com/uploads/files/kozopaxozajaxazulogiga.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e4d6205801---81845603549.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdf
    • https://osikovo.eu/webroot/img/content/files/54310955373.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/19e6de18bd8a1201c8ef7299d540c367/rutelir.pdf
    • http://shmgec.com/Uploadfiles/files/bofivapilepafamagomagaz.pdf
    • http://aibrpjoaae2.specialty-match.com/upload/files/tunojasativadimesap.pdf
    • http://carshopm.com/js/upload/files/vetiz.pdf
    • http://ratchee.com/ckfinder/userfiles/files/1099869815.pdf
    • https://medicabg.com/uploads/wysiwyg/files/78023342779.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367ee722138---29167185315.pdf
    • http://gavionescodeinsa.com/userfiles/jevofupagofep.pdf
    • http://partnerplus30.ru/images/fornews/files/82941756800.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ps+vita+tablet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41b.bin
c0af089ecdde05af5a21073b2e53b3956137442b7d5ed126bffccef056dea0fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 19656 bytes
font_01_sfnt_off000106f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 16792 bytes
font_02_sfnt_off00011f07.bin
72e4fe47147e95f770f136ac91d9e4e23d3a47b707b5fc8c93f829dd1d76a879
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 9984 bytes
font_03_sfnt_off00013555.bin
b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
pdf-font-stream PDF embedded font (sfnt) at offset 0x13555 16148 bytes