Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d14801fb8bf962…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d40c05b9095ec16bcbd883a9bc08baa SHA-1: 58f9c160877cf6a0ec3c5aa628a7e5138625ab2c SHA-256: 80d14801fb8bf962e143ef846d8c1824c4dd4bedfde5cb2ea228834522678388
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The PDF also hosts a link farm pointing to multiple distinct domains, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfiiauk29ho8etd1h4brluirh5/87742848367.pdf In PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/18902673296.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e99b99d19f2bbe19ed82907c326701a3/2241920255.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xugomalagadivujonizarag.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/95494047290.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/sogeb.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144c2c72da6d---20579898473.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jonazarirurawerofexuki.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nadotama.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/9065177159.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/10830951829.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/3270145523.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/1764572596.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/mabizusoxipetudasunab.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ff64eb96d---30101822619.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44792056561.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/xonej.pdfIn PDF document text
    • http://potlista.com/file/files/17789811687.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaddbda795---84753187007.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/43026691553.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49adbfcc6---32296032850.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/57668003217.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/fezegorekagakutuwukugil.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/73614789183.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/83490088238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+wavelength+range+for+visible+light+isPDF 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_off0000b752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB752 10748 bytes
SHA-256: b381b6b901e784344f767ebcb98fdaa78607092bb5a8d8187adfdf1964e53e00
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 15248 bytes
SHA-256: d22eb0ec44c59f36a3e631f7f8b6aa7c27fb0a9bde0bf41e4b0faac4da00a4da
font_02_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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