Malicious PDF — malware analysis report

Static analysis result for SHA-256 300c65c29467b89a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 19:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 570a8d4ded906d95924b63072e4d1a04 SHA-1: 45f58fbaddfd0aec0cf705ea933413252db8c8bb SHA-256: 300c65c29467b89a2840aea7b017e9ecf74b931cc29c0ceefb87c760c253f0aa
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://agriturismolescuderie.eu/userfiles/files/76423208315.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d6cfad06c6c11aba265702792ffab2bd/tapolaj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfc9d15e42---gonimerefofubax.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/vitizalepuzi.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/3303803618.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/29780484603.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/polejatakuxolakebe.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/tudupexisonitalepero.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/nabam.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e933121ca---35022207995.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/57019674685.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/datotikepuxur.pdfIn PDF document text
    • http://fnathservices.com/upload/file/57867883616.pdfIn PDF document text
    • http://generaldistco.com/images/file/gadabuzebo.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/tutetekopijase.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/robinifiwutidakukilojika.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/35986435063.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/22653171569.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050707165573499.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/wunavovumisenulukap.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/45088534968.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/36765484f8a5f15c5997e8b88e80999b/11293950898.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/58643314810.pdfIn PDF document text
    • http://minerva-collection.net/files/files/92717761053.pdfIn PDF document text
    • http://gr-chem.com/upload/files/komivutebubudiwawu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/be707edf0b39a22a15fe7a47f4b5308c/puwuxebewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=objeto+directo+e+indirecto+espa%C3%B1ol+pdfPDF 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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 19852 bytes
SHA-256: 4a1d4950ea5d722cfa8c7ed4392f115fa4b7e9ac65239bd4f5c0f9a701c6a415
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 11112 bytes
SHA-256: 7400b676a4bac4d9a6d60722b0692276a589888c17112e04d2383f31850a65a7

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