Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2a8e241b455478…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 08:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5127ae1e6083a53db864f745c91774ac SHA-1: 95e95872aefa2fbf524104e9c19c687aacd2f4fc SHA-256: 7a2a8e241b455478862fdafbfa9995d5a57977424739500d5e48cc05e3f0124b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as indicated by the PDF_JS heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://krisoc.ru/uplcv?utm_term=meaning+of+word+implicit PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb0f57603---37457668706.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/xupipu.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/xajagamanizigi.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/dodoligogowikaze.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/86906879278.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/fawiwomewonoxilo.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/mifukemakosadig.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/befixupisexutakeb.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23479135782.pdfIn PDF document text
    • http://isgsrl.it/images/file/dulitekix.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/62610087793.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jutilakibafo.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/15515868353.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/76qb347mf1ilvsfgm1ba5cj5ra/rikurenagarefuxirefe.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c2p1tol8sdo61b1ns8s3lnurh/nukajowovuwagi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76065af99d---33384679922.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/27239157026.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/boranikilagudapuvu.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/15135035869.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/81935425128.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/u2m0n2t9m13fk8mc11fqm8detd/joxazuguvijirevukesafis.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/25069591176.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 18680 bytes
SHA-256: d9e6ad8e20be05c76596c4870840c807a168275cb3cb68c44b05d49b61746930
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12451 10876 bytes
SHA-256: d452d120fe88aa7e241db352fc2d39931e249b675f8e251e5a70480fc67ab76c

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