Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba68371096dff55…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3328fb90c5f436c2dd412236f5d2446c SHA-1: ce41bd79b8f99448098be93f0a1b66a44267f0e5 SHA-256: fba68371096dff55500ec9611be24f1d58b646dfbfe64116aa978c2bcc65cfa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://astdubai.co/userfiles/files/98314412866.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/316aebecb2f4c90dde16ca4778936cb6/57810262247.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/87627345989.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/zusimamaw.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/xofetavexogasaj.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000e09b230---33674563688.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/natuwititokagazonome.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/jeluwakafokurowageletafe.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/35327676580.pdfIn PDF document text
    • http://baove24h.info/upload/files/24967888638.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/suwigujulosidajamowo.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/10442406560.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/ruvak.pdfIn PDF document text
    • http://faradbox.pl/files/file/33328060324.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/folovotutanevimujasofafo.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/lilam.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf18f17af4---nuzorexogafireguw.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304976964742.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/95850180551.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/17289858189.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wupiwuxowebanededobepase.pdfIn PDF document text
    • http://tipiland.net/upload/file/bivibolobamulotexemuzimu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/4673392721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+turn+off+alarm+clock+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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 10604 bytes
SHA-256: e58fe818932852742410362194c824692eb35c26cd5dcd7d7e5661e349d75ca2
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 17516 bytes
SHA-256: b4fccff7c5bd87f56ba8de94fc4a094785510b4d373d726829d634d0be464827

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