Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a9adbc8634cf0a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 14:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba78210638d6792b8abc6c656f1a4ca9 SHA-1: 6a41f9a53f5f7d5a85d14fe9872146edf931ff10 SHA-256: 64a9adbc8634cf0abcb4a50545051101f8ed59f74e3cffd5110fb0c844d97981
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of further malicious code or redirects the user to malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=app+lock+hacker PDF link annotation
    • http://sangjeom.com/userfiles/file///ranugesepadenepepajiwoze.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132833796fc3---zopoxelez.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/teruxojosofukokodetosiki.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/genuku.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/safewosojosoxowafuvil.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/gasajedikaretigevoburisi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/tavosu.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_223402.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/85273874138.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf2b2bc2d---59353223546.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/32758730908.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nadosugir.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/risodejo.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/qhluif0kaan8ke5gh5vpf3pqf2/48300314235.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/dewonubazurifafevopexe.pdfIn PDF document text
    • https://venus-forever.com/image/files/susugewaralel.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/82652483025.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210915_3D417475A074C55C.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/2710687193.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tugeronotininojaduxede.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/ginerebenow.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/xogozulenavuniravej.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/kojodimimematubatifotapo.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/dosugapuxoximulusij.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/gixokekalanetimewozowad.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/vozep.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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 10084 bytes
SHA-256: f8074cdcf496af03cc7546acce0aee2390b213a8a39c1829abaf18cd4d6f3eab
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 17128 bytes
SHA-256: 719e75c01c2a1d7cc8596a878e5d3dce3d1d575d0893159189991f73b74a53ea
font_02_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1