Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f058b85cfd2513…

MALICIOUS

PDF

94.9 KB Created: 2021-07-21 13:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6730661a5110c6f54b3f326e6b512244 SHA-1: d0df1bf67f2881ad8b0446ee2a4584df298973e9 SHA-256: 74f058b85cfd251313e907bbd495753495d0645dbd1c4322ff1f787bd269e576
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. The document also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://hkxhjfc.ltd/uploads/files/20210720023203.pdf In PDF document text
    • http://euro520.net/userfiles/file/1621161462377449765.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f17b0ddae93c867f1a0c54beb1d851a8/65419811326.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081099d8bc03---sedotakoxamoreriv.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/8340515286.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/81516787165.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/a8020ba13715eea3c3d7525b5d597639/82114374432.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/96783253878.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160813bb6c4f75---kawalekugijetapelexex.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/85572824817.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117fe8ec9b---26764058359.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/40467327884.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/moxodagefotofuwulavaviwen.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9875c0b78863d7fab7acca133c267188/jizirasagirew.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726f1cd427d---xetogapemovibamutijim.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befa927743e---96563014306.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623475548.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/10tndamfe5q8ekcfvah5hsj098/59834553932.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1f74fe49---lumevififuxawad.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072103b808f8---sofunewovikixurusixupepo.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/30822317556.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0df53efd4c---67430370495.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16752f0ff---19571327190.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/60162116669.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c348e20e8daa0db3820bc98967545094/93905572515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=another+name+for+property+managerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17164 bytes
SHA-256: e6b054c643fe30875a8292b9f163590a036ffa7c8254f8b9f825f7d0779a37b1
font_01_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 10592 bytes
SHA-256: ffa722a123b4d21e552ebe57d2242dafa9d95ff90d5a786dc26a192c6e01d22a
font_02_sfnt_off00013ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152EF 17644 bytes
SHA-256: be208f4290933249b272d48671578f93454bd692c9acf49a1fafe5b66032ce96

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