Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dabd204fcd00c0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-23 06:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7330dfde55717239b85e591d2c2c7b5 SHA-1: 458327c82a66e3f18afc57f6066ccaaddfc70f8a SHA-256: c3dabd204fcd00c0087f3f5474f7bc5dab983c790ffdb44e0fd31790e6fefa2c
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 links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious content. The embedded JavaScript is likely used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=private+gallery+vault PDF link annotation
    • http://cbgnfinance.com/userfiles/file/5997315513.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f710cd16de52cc24fab1c3d2c09edb46/52482675367.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/teropomifigupirikex.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/91626824047.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/94008677095.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ovs7lvgfctv54l9qbul28vjnc4/78815494550.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fisalini.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210903020107.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/811616452612fe8323da43.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/xolugifofudiwonubasegoj.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/nuxodapi.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af5e3a301---tupazafukigat.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323abcc3742---mazetusopenulokidu.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/70804637479.pdfIn PDF document text
    • https://cargobull.cz/res/file/sepumuduvopesidumux.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fozobepukofesa.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/notinesotawusiki.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1928711d---51945738457.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/duwikasun.pdfIn PDF document text
    • http://rooptex.com/uploads/zimozaxevizuwegarirujo.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/ruvezobexopikaxagajugogap.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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD22 10172 bytes
SHA-256: d0f62933bac59cab3a3a62e8505ebfd86cffffb2b8bd318cc8e566d0a260e77e
font_02_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 16520 bytes
SHA-256: 5ae820d2255acc81bab010e5b520331c3183985779dab348578a6e9c67728ce2

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