Malicious PDF — malware analysis report

Static analysis result for SHA-256 202089f8980058c4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 02:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b2f7dfd1bbf0528bdf9cda0c81db210 SHA-1: ba2d3cf3522e4ec9af2ff80438de2e296e1f5275 SHA-256: 202089f8980058c4f15c86474499be70ef41d10fa3979a50705f1df4c9c2646c
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 delivering malicious content. It also contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://voszveszprem.hu/_user/file/riwub.pdf In PDF document text
    • http://dinskayarealty.ru/media/file/guxozubonowuwir.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/21312588761.pdfIn PDF document text
    • https://hinaweb.com/upload/file/29263613778.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1428a399---weput.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd107c866e---zunugogajovegikodamidijen.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62ae49e14---92869341053.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/36012381227.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/depojajejaki.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/ruxiwizofonetutinakesuk.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/mupelibivoz.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/logujilatoriv.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/rifaza.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/716569409.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/nodoru.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ind4ve5bev7fhlef4okc2pi4ru/fadifakavorelemabokegive.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8238086181.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/xagofatigevipojajexa.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/9931518288.pdfIn PDF document text
    • http://okun.su/upload/file/savutolamilunuwowegaxiz.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/69763119622.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161342168ab3a7---fixixubu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2363238a119293899d1c5d9414a55d82/leramozifetisujezosito.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/35960194131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+a+video+from+a+website+on+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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 17256 bytes
SHA-256: ac48ee46dfd2b2d2cebc5c8c7e7d71a48e522080235d072c5f5372bd8ba7d5a9
font_02_sfnt_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 10800 bytes
SHA-256: 66558aee39899ecf538054741f4c7fc6e7813ad66bfd0164ee01ebdfc8e828ca

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