Malicious PDF — malware analysis report

Static analysis result for SHA-256 817195ef6bff71d4…

MALICIOUS

PDF

95.8 KB Created: 2021-09-12 17:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd6b9a1cb9cebf8bd556f8e7824d014b SHA-1: 8045b772fe2ecd08bed9f2dbcbf6dcffbb4bea66 SHA-256: 817195ef6bff71d4993cfb5c0d70a8eb8e2958d4d98c60f6563d870ff6a803f5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://china-engine.net/ckfinder/userfiles/files/firipusalonika.pdf In PDF document text
    • https://estoniapools.com/contents/files/dufubejukatixet.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/fepupozirexisorujako.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/67985290719.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/71535550015.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/33589255642.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/08/52743604686.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gukun.pdfIn PDF document text
    • http://ergakiland.ru/files/files/73566022240.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210908_DE29B3F4E233F4BB.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/bowoxatokosos.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/takuvajegotufazipub.pdfIn PDF document text
    • http://denge.aero/upload/files/garip.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2c82c078ea41166ca4260499cc33dfe1/tajimakat.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/8965676491.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5422bcf3499c9a8668d9eb73b7d594ae/13516412371.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/wufigijenemibupero.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/duxozaxawoforetuwelunemo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/750d3b6b3636a8b056a557104d7c19cd/sobuwaniponitefoxut.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/zoxuzaluwuva.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36183827140.pdfIn PDF document text
    • https://basisnomor.com/contents/files/467282030.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/37379507153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=formula+for+area+of+a+semicircle+calculatorPDF 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_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 20788 bytes
SHA-256: 54b3d98fda17bbcf3e9b1072d70e742eb4b20792c169b2084c99bed9c07f6096
font_01_sfnt_off0001415d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415D 10468 bytes
SHA-256: 7634d95ec977adc6ed860cf8c9b631a967c86dbd9d08f7e18ac221a2f9399329
font_02_sfnt_off0001592f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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