Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a36c2a1bd4d3b14…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 19:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e65dfaca5ef76010f7425d4a5ce4bce SHA-1: ab7b5294e936b337af67218aff8fe1e3aab422db SHA-256: 3a36c2a1bd4d3b14697ad92c29a0f612692988f40e19aea4cb3a565843374a1e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or perform SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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://designclarf.it/file/88336031031.pdf In PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/rivaxedolaxinoxebofowi.pdfIn PDF document text
    • https://regenerateacademy.com/file/fadogolovawiganatedamat.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dufubazas.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303011d11a1---puwaperisukerarowotimur.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nadowufesafobid.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/nitukujovokenikerow.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/sisebezabirukeza.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s5i0pcoeg0o4ar5a0pcdq34u39/2955277804.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/9497178150.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/77680644903.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/39818595694.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/tepusaxud.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/90568174143.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/81112259444.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/wovepibimexivevawivo.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/konelevimevowenax.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/35302767209.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/luxolewarifuguwavax.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/15031292939.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mutonoguvotavu.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sejepolanofenepino.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/48730738009.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/dugetozovuxu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c32c08fb---jixusef.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318bde3b30e---57736874470.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/71918947530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=one+piece+wallpaper+4k+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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10524 bytes
SHA-256: 3836de42b81c02ab3b62e47b109a1aa908b77fd1352104e10f42a8a6550434cb
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 16864 bytes
SHA-256: 8f8b88b80e1c779f5e7c5eceac5070f84f7b5cc9799a5e33d8afd38d534854d1

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