Malicious PDF — malware analysis report

Static analysis result for SHA-256 7498ef06f4158c42…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 00:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7362d8463c1560b47fb0a5afdc0b65d1 SHA-1: 0d2308c6c8b8d88fd228c54cf7ee774fdb56fcc4 SHA-256: 7498ef06f4158c42cdcec4556c96a44e11784a99aa301c268d1a1367140fe177
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads, increasing the likelihood of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

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 http://modern-pro.ru/files/file/sudexag.pdf In PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/punolutibakowekelabapew.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/76a7fdaf5b7c87f7253e3139e7064d13/6779602907.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7bbf6c68da16de3b339a3d060fb56aa4/74744365123.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5ad8ea9dd---refevanovamivudi.pdfIn PDF document text
    • https://zhansq.cn/upload/file/17834267251.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0f0819c4fdf27dcc11572d5fa085a4e1/zujomeletiborizadoj.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/weferelex.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mdah03uv7gcnls33b5jg35qj10/lozagazusobi.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/37204168328.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a224b22f4abbe9ec4d6905cefd8f86df/61575826278.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/61926464022.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/kubivizetonegopudovatina.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f8361fe87---1995337837.pdfIn PDF document text
    • http://ridendo.cz/files/file/vuxepugovu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffbe758cc8---degitijesejefovowujesi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c2dbdd683---geperipajagewejatisotezik.pdfIn PDF document text
    • https://petala.gr/userfiles/file/wadezo.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/puduvisig.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/94802063640.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/xomikuxixerupo.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/27632125528.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/81269806422.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/95454587888.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/20990835877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=partnership+goodwill+accounting+treatment+pdfPDF link annotation
    • 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 11252 bytes
SHA-256: c94ab2fcf798507a25ec253b7a82589953bf40cfaa8212a0beae004e7079b43c
font_02_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 16716 bytes
SHA-256: c9ea34b983a7f535f0a7c1130fb172fd45b5fde957fa2a59bb4ad9ed8cd3e5fe

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