Malicious PDF — malware analysis report

Static analysis result for SHA-256 191f2f0ddf2f1958…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 23:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 64eb394e2114968b5db3d5ff5d6a2d3e SHA-1: 2ffde0c2f1a8b9115f6ec3421bb4c848351ca610 SHA-256: 191f2f0ddf2f19589f624acea73a555e88f245df49f6e04c1ae51cdea034a1ab
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=hill+climb+racing+unlimited+game PDF link annotation
    • http://jr.ac.th/ckfinder/userfiles/files/64216877780.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jozawekaf.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/58424577285.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/garobutomirik.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/7040319948.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613926207e6e8---35851801100.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/62075461040.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/66105940613.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0ba5aa44d072be607a2165ff069f147f/vebamavovaroweb.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/96584370798.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/91412018053.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138da419c602---91428522418.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/zusodijewuset.pdfIn PDF document text
    • http://balalajka.nu/media/94169301202.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3652e70b8be8aca32815639c3a52f96e/gisivim.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/78718889878.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/nugaje.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/31526549105.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/24411660845.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/91291894247.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/51717398391.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3793a95f---66263812110.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/98312876838.pdfIn PDF document text
    • http://baoveantam.org/upload/files/28980699885.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://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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 18468 bytes
SHA-256: 9c55191db593657a520add53c50c2559f9ab6e2fa4959021d4f753674422b3d3
font_02_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 10656 bytes
SHA-256: 27a5abfba68904436c8407f1b423f0aa482a21056c00d6b8dd445461e093c6ac

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