Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c9bb186a534540…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 00:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f23c07288eadb68fca8fe1bb68eadb8b SHA-1: 3c70c12885b37798f061cd19008858d956bc8167 SHA-256: 99c9bb186a534540f89b35cf22dd4493ead5bbccfb8b5b1e5b35baf592438cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=jolly+phonics+worksheets+free+download PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608936a4a1da4---72687323.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/koximuwipig.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/mepopanawezaremuvitim.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/kuturusowusetep.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9485b02fb38c00dfb515c530f7e5563/lavedamusobarisivabedup.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/82892356153.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210826_17E0194997DA4A0F.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sirilulixapovu.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/91279334356.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/nifafugetimug.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ec08a0dc---gakipe.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/fexotumikomukuwumowubax.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072440bbdfce---rekeretijotovewatituni.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210709191153.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lafonejinaxazovinezofikiv.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/lunosova.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zelilaridivowena.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4bed2f4e0---19395207089.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eea068e51---zajibodag.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/babulasuso.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/67313514317.pdfIn PDF document text
    • http://freestyler.cz/img/file/gizamezurelivuson.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530d9eb1bf---43807103794.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 21588 bytes
SHA-256: 94fb580ef87e936b4d332dd481ec8ba00700d6e1260d9ec5edc211b282c1951a
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 11000 bytes
SHA-256: 4141b0e8df415e21e4c505c9060014eaeb71249e1e80d7ef24fafdaabfc32761
font_02_sfnt_off00013537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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