Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7339e7d2e0647be…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 07:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4edc578e849e731fbd76284781befc76 SHA-1: 2f7b3a26036732cd8ac3755f342f590f54c2cab6 SHA-256: a7339e7d2e0647be7da511cab80989fffe0d2ef99304b9da6691f94470ca865d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to redirect users to external sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=free+rainbow+six+siege+codes+2020 PDF link annotation
    • http://jinyudachem.com/upload/files/8253156251.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/borerozopubofuzanedi.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/74782118441.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161410e1d6898b---63043489731.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/51143310800.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/21705610573.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/93768516863.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/winefajalikemuxewabap.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/zotawupepawetiwun.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • http://chikatere.com/Upload/files/gurezatopita.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/84f9k51bpfe6khhq6c1mqthlr6/72286004284.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/dorotawanorisexogebudume.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/95335423525.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/karamivumotoluvuzar.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_222912.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d658f2dec5---70212905828.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/momikevujipiva.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/xazonineperedofaroxorot.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/gowivupiraji.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/noxone.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/92218050411.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/fugezelabokavab.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/37127762142.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/80005618684.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tukakop.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 17176 bytes
SHA-256: 26644ac26723526b5a359d6bc6b15420524ecde3b8eff5f51bf244ab7a3d8cd3
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 10948 bytes
SHA-256: 7608b23b38d702a91a5fb1dcbde90ad9f638d8f168a36ed10b7029f47b86a190

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