Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25e61f95e892a3d…

MALICIOUS

PDF

114.2 KB Created: 2021-06-27 17:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ec1078fbcdff7be0b6cc6192147c063 SHA-1: b10f2f234fe8a1e7ec147867832836930c8fd282 SHA-256: e25e61f95e892a3dabaeae9b2e52da6c922b5de98baec75797d1fa70f8744566
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=arsene+lupin+the+queen%27s+necklace
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9933n74n5q7jt3qb5l41ehelt2/wekunabev.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/73ebd8830eec9ebcf7d39bfac167334f/257323315.pdf
    • http://alituncer.com/userfiles/file/91287387379.pdf
    • http://pusancard.com/userData/board/file/sakewube.pdf
    • http://bjjiffy.com/upload/pakajarove.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c3a4bbe2cc2770192ae60275c7b3f0d0/vasonumibid.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jutibusowinonugovidi.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb4ba78d6.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5immvjhgncibd3rc8nil7g4lv3/xitimugunimiwivolok.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09b68779af57be5d0a9b92d8c55687ac/26873510931.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160767eecb2a16---57145959458.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915356dc13d---25390860231.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aefc510681e---9962478500.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607645d021cb1---37835484705.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c520b8cb7---49557256120.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f464172b1d9a45f0822ebeb33cf772b0/woxufumunufiziwonatovipaz.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8e61apfa2c2o30ab0a0befa64g/25872171176.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090189e1bbf6---tejewidi.pdf
    • http://worldnaturalfood.com/image/upload/File/66552779423.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/76b94f187310c335ab9256a6e70c38cf/72380526295.pdf
    • https://an-professional.ru/img/files/file/83035832377.pdf
    • https://aimara-bg.com/userfiles/file/lamave.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/04kd6nua16i4j4dtu8t9aonnuk/jixoki.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9524a9d844---51830363109.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015950.bin
78a1d97fb2d2b3a536df7c01fa13066dd8ae5495c1873e7fabf29dc7c9925d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 10704 bytes
font_01_sfnt_off000171e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x171E3 16792 bytes
font_02_sfnt_off000189f5.bin
dd1a52d96d97e17acec6038fb09aef7d90672466b589725d522227a942ce3771
pdf-font-stream PDF embedded font (sfnt) at offset 0x189F5 19836 bytes