Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fa40cefbb3c41…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 12:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72269f7f0fd6fe771d52f47b1998f499 SHA-1: ada4bd6b85f4fb3cae5970c39c19c3c17e631867 SHA-256: bf8fa40cefbb3c41cfa0337c616668b91139e98ff75e0ab5a38aa6e4e8844c7e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malware or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=free+50+followers+instagram PDF link annotation
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82574525403.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/82169445754.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/dagolijanoxefuzuni.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210901_DF2083014B49755A.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e893d08d---risefujipuwetelanituriluf.pdfIn PDF document text
    • http://normel.org/files/upload/file/merirud.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c21fbc6077a54476f616522b6f8f0b67/rizupax.pdfIn PDF document text
    • https://bloc-immo.com/images/87984043378.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m85klo0sdgslcou7udfv3slll6/zeviwomivoposozoguruwujo.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/45928534820.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef89702bb---96084008175.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/ranadutu.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/71106216454.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vomizapesinisudiwobo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/11889282057.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139b20565c8f---59247688075.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/45206646011.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613358110af59---zavobuwil.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/gozowuraxabewunozafamiwu.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/lomaxufegelawijogi.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/98607746036.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/tumowunixezowakoz.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/15730992071.pdfIn PDF document text
    • http://short-story.ru/upload/file/nevogibolaruxotute.pdfIn PDF document text
    • 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_off0000c709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC709 10876 bytes
SHA-256: bdefdb5fca1d30401c0b2ebd73740cb4c5b3ac3638e30aa384d73c39d64187a8
font_01_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 18168 bytes
SHA-256: bc85d38ef09ab6bc66f5ef91fa0009b0712e2d0e1135ae38a9761d09ad84de08
font_02_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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