Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75aac1b1806f3a8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 05:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd8640e96d15ef39651aeaac15c763e SHA-1: 55f30c6774624a8d61b05462496eccdbab1f9ea8 SHA-256: b75aac1b1806f3a8dd20a7bc12389df98fd6bef1a07dbbef82d91e5dec0cdcab
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://telechips.com/ckfinder/userfiles/files/2730983893.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/zamefuvisadifuxisedunu.pdf
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xibalizuparokinuniwa.pdf
    • https://portalbime.com/UploadedFiles/New/file/28177460753.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/7b0a3be1b8514f8fb566def9a28cea76/besaxizesuvitelefew.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/00ba2c9b766e10b49db95c7ca2478948/45482565146.pdf
    • https://www.opsclown.it/ckfinder/userfiles/files/68219215734.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/83536847854.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/425269bf44832d54f365ed89a93f3cfc/8914412279.pdf
    • http://ccsl.asia/files/76849884759.pdf
    • http://acutecardio.ru/sadm_files/laparexaza.pdf
    • http://verynailscm.com/user_img/file/56089229578.pdf
    • http://pekingtogo.com/uploads/files/mibuw.pdf
    • http://zjgyuanhong.com/v15/Upload/file/2021913419563481.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/3658291095.pdf
    • http://gallery4walls.com/upload/editer/file/bijujamomukapenesozu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81db9dbe---sidonoxapi.pdf
    • http://nct-vn.com/userfiles/file/jovupibufifisugagaze.pdf
    • http://firesecurity.sk/userfiles/file/34949742847.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/i314ls96tm21jlik0t39klp5nf/badegixulosekugezobago.pdf
    • https://kamwalibais.com/userfiles/file/50142809276.pdf
    • http://swaptoys.org/ckeditor/uploads/files/wiguzetivevipulabiwakig.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009180f2c1---931490134.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/88192057d647204d66ce0d9b4fd13bda/gorirur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=wwe+2k20+psp+highly+compressed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
font_01_sfnt_off0000f5a3.bin
ef83463b3a80b20081c88bdce07e8958793450075b25c902ee60768b7f3955ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 17756 bytes
font_02_sfnt_off00012387.bin
d50f4be22e3c2559667ec7b2d710e4956cce0d7854d02a656ed9aca866310250
pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 11124 bytes