Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab92e6af65789080…

MALICIOUS

PDF

80.0 KB Created: 2021-08-21 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74b864d19334a8983f48c7c78f34ca60 SHA-1: 258814e921a45cdc8d6090a2855b174a2d0432f4 SHA-256: ab92e6af657890809fa4a9ceb22397e15c44adb63a454479b9ffeb3269b46059
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to download and execute additional malicious payloads. Heuristics indicate it is a link farm on compromised WordPress sites, and the document body suggests a lure related to invoices or payments. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964938b6259---tunedorefu.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mb4glnn8e47m7pc2n1jru668at/34776932160.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/96395eaa13ebf02c22f92a93aea9be91/84935551632.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210527110637793324bziv7l.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/sutixetozulisijadefi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/02b1f62a7156959d4b5d6681927b89de/29427470295.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/98857400433.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4a2d4f56238ae45c6c0a563f53b3716e/43983817461.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/metumeniv.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/79eb1c307ba84639d633e573fe6c381a/46176217278.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/43544843937.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/33515675128.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/tusuxeluvijitoti.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/31198147384.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/86962048401.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/jizezevuvubuwojebiwezili.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/geduneluberowixi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ebc15092a---musovobavavejibaxudim.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/rogoba.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611770c8064a1---bubosadesaz.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/06f0d11dc69d76d2e8a7b51bc2044f22/86467438274.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/fidulobetafug.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210607/file/16229969868552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=accounts+payable+and+receivable+template+excel+xlsx+filePDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 11284 bytes
SHA-256: 49c3be6456fe002c9bbc4c72bb8ea47c8f95ffcffde1f812fa45b8b3b619a74a
font_02_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16796 bytes
SHA-256: 1762c20161694df0b7aa4c1abf3f8bad8cf7c9c7aec26d7be0419676d041a0b2

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