Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe0e77a537a52a6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-23 03:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a9753f279044dd3b88a5cedbca6d865 SHA-1: 02b07b908af72ed43b330b04b5d4c9c2d6fe5d39 SHA-256: ffe0e77a537a52a6b03cb3e8a228e98175a962bf03429a52190dfd764e4ed42f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba74f0f617---98347509077.pdf In PDF document text
    • http://tdybio.com/uploadfile/file///2021092019093775.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/8796088806.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/60047389543.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/71475483922.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/dutow.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/77845297019.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/75870114947.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/32246550781.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/b67hpojmkvjvoefonvo9uv5jl4/35334049972.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/jerusanejowazufugafapivef.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zatulonoguxuti.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613803349e2c8---54523502682.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/zovutijamat.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147000ace09e---29924140129.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/nifujololitugemafema.pdfIn PDF document text
    • https://cet.sk/res/file/64885142161.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ikuv4kd56qpappkbhndd5v01fo/4817475923.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/toziketovixilexuvamok.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_073301.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/72220086778.pdfIn PDF document text
    • https://bczenekar.hu/files/file/niwamutazuzejejifax.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/parepanal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gt5+obb+file+downloadPDF 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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 19664 bytes
SHA-256: 5c4aca78dacc36e572b848d9084d874b5b0131dc57d6c279bd7e9cab2f4c67be
font_01_sfnt_off000126b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECA 10476 bytes
SHA-256: 9473f0facbd37ead4c0b0807e9e4c30162ad5273a01f5ac62600ddd294b955c1

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