Malicious PDF — malware analysis report

Static analysis result for SHA-256 15710f3b25423812…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 15:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b5d6e6bd5a7378931296bff52eef714 SHA-1: 5c483ffa8bf92d2ec9efefe59238975b6f3f84b6 SHA-256: 15710f3b254238127cff63b775f91ef604adbcc1ce1d3dc2b3a46b07577753c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=ghost+adventures+cecil+hotel+putlockers PDF link annotation
    • http://multiflex.ru/userfiles/file/siveloviwiwoxivigewi.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/xakenomopakege.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/34695357015.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327fca6dbff---donowuxepedumenabunos.pdfIn PDF document text
    • https://ms1oke.com/contents/files/83081046283.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/punagokid.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/sisawuxexon.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00c1db1d9---35529242271.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/labidipevavozikipejamub.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/wukemamefojekif.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/62189445146.pdfIn PDF document text
    • http://esperanzadeavila.com/fotos/file/86077695581.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/95679245118.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/pazivolududixegi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9fa9f84d---40521125411.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613518982874d---36545200788.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210917040115.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/voveviwezepola.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/godetavatekenu.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nogebazifolemikoruzutijin.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/18214093122.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/5276993395.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fa9fe4f426fd42c7dde51b47b46eeca7/26114797361.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/pulav.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d39764ec247e18be7476de75baeeeaa/noxesoxiw.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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 17160 bytes
SHA-256: 3a020aa2eb7ffdd101e2351d0f2fcf674fc3f7a5ee1b6e8e40059fd5ec4d0326
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10908 bytes
SHA-256: 9552499597251d673667cb6b71f56dc98ccb071cc5f6e2dcf7efca9066a9b4ab
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1