Malicious PDF — malware analysis report

Static analysis result for SHA-256 90536bf28af667bc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-11 23:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d48d9fabcf9ba6c35248273f0eb52ef SHA-1: 9d83dd6e3bf9be2f9f92de470e111319b834575a SHA-256: 90536bf28af667bcc3e858bad93b746fb9ed74684c4a762e23ef471e8b4c64f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aviapartner.biz/js/ckfinder/userfiles/files/28360986320.pdf In PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/banuselewojozogivi.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/73738381676.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-08-22-01-02-36.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vimozof.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/47222029480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1be72713---32705157214.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/39684936408.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210904_B7386FA2CD7F972A.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/gatulibukon.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133985326784---2197106833.pdfIn PDF document text
    • https://ikansambel.com/contents/files/dolizuwerakujazitapuvev.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vovujiladojubasasetimonik.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/87646495237.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/13954157323.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • http://gojjang.com/uploads/files/88098889714.pdfIn PDF document text
    • https://curvy.tw/upload/files/73880659551.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/91u9e5ag732132i7ppjjsgu88g/95461379501.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/witaduxuzijew.pdfIn PDF document text
    • http://cissi.it/userfiles/files/87078890950.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/53524121225.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9c72055a90a0e436b6673d256ead7fc6/36535307807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=go+launcher+androidPDF 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_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 10340 bytes
SHA-256: 7af938451fed969b5593def9a6318f47eb6211178f5adbda57f83610d5656fe5
font_02_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 16460 bytes
SHA-256: f73a65f90fd1c9b530bf8295b9fdc10c6091f582d0d7355f4d95ad8307c28ec7

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