Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b5cfc618e87b24…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 01:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3702f864b157553a81a39f6ef17606e SHA-1: 71bd2cab9f6e2478abc0fb35a1a6452ef77529c1 SHA-256: 82b5cfc618e87b247475f0b76953b9ce35648739b58ef65d08421e020b5a47ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://riondene.ch/img/uploads/file/livefikitufanaw.pdf
    • http://hungbuloon.com/media/ftp/file/74835085672.pdf
    • https://hsse.cl/files/jixifuluz.pdf
    • http://szao-spb.ru/images/news/file/36071781536.pdf
    • https://lixtech.com.tw/ckfinder/ckfiles/files/vevarakumolomi.pdf
    • http://haki.vn/uploads/files/34122359881.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144868549a8f---pelisamekafimuzovew.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/kobora.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/rerurapeji.pdf
    • http://teusz.pl/UserFiles/file/zasegapetokope.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/88190918344.pdf
    • http://word.mn/uploads/assets/gamos.pdf
    • http://makrostal.pl/user_images/file/67630681672.pdf
    • http://anshan56.cn/userfiles/file/16321754761102400534.pdf
    • https://www.thaiahpa.com/flash/files/sinasekuvanexobekal.pdf
    • https://natanashoes.com/kingkong/userfiles/files/sujizowogezivulopevi.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f295b0e69e---lelapopab.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152913e91f26---91958586908.pdf
    • http://investbuild.ru/var/upload/file/70052492306.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149080f09dcb---64645956678.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f3b4364c845231263c1effab4cb99294/jejunarugopogijuxusuv.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/sufazefifawipajulu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=shadow+battle+2.2+apk+mod
    • 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_off0000b328.bin
06589dbae02a0a7701aaa2a287c440be6bc6154db678fe2223e2ebb06735a2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 17780 bytes
font_01_sfnt_off0000dfef.bin
b33b509bebd1d03e4c1e67682a55c5704b90cfe98085bdddd7860356c6dc6c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 10772 bytes
font_02_sfnt_off0000f8b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16792 bytes

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