Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d0f432d1ed9d81…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 01:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 307ab4c9d3a1cc9b68307445460f498c SHA-1: 26060de54e3d0cf7a52215b6a7dbc6daa544186b SHA-256: d3d0f432d1ed9d8102d54135770df367d7cf83dfc7a101e18892036e4574ab76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to other PDF files hosted on compromised or disposable domains, suggesting a malware distribution or phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://ngoctraithaibinhduong.com/uploads/news_file/66313769060.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/zelemurenaregivu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uj0f2f40jpd0k9qrps97eho123/jilebakavusibizugujunan.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210914_0856ACF5B610E829.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/fafedapusonu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/4513913734.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905153338.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/14524135271.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wokudipisin.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32658219551.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/85453577392.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/32577390791.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/lowajopu.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/ledurotomaboxugatag.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/gapotomumox.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/wupivamebavefobiwon.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/kegulenuvopinogiruju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488a6768ad---64248196634.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/adac1acba3bea6fc750bed6b81e6a20a/50178406070.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/modajerogu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/94349115751.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/170528094793.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fotukupevuzulukozivofim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hack+wifi+password+wps+disabledPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 10720 bytes
SHA-256: 3752fc6199248f20476e153fd84240ed03b2348cab375920a4a94e77b844e5f1
font_02_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 18052 bytes
SHA-256: f80cffef9e298752cc8222563ce48b6bf35f102c8705917f7334b5fb77289fb4

Open this report in the interactive analyzer, or submit your own file for analysis.