Malicious PDF — malware analysis report

Static analysis result for SHA-256 9969f6e4b974d626…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 20:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee7678a292559fd63db413136f4e1972 SHA-1: f8765e495fb88be3abe8e45c522a1ebfbef1e845 SHA-256: 9969f6e4b974d626a220410b928949bc8db8fb446c814d56b74b8625986b0e6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a likely phishing or redirection attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this document is part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://redemaisfarma.com/userfiles/file/48427209038.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/45741004061.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/keritemilan.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/32804119384.pdf
    • http://gulfcoastlist.com/userfiles/file/49049673344.pdf
    • http://zetrade.cz/userfiles/file/fosoke.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/887ca4a432fe6ba156810fb146167d11/21365651798.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/33630463506.pdf
    • http://jiab.net/userData/board/file/newijegizaxogu.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e6a174ab5f0ab7ed9c261df6d36352a4/ropisuvof.pdf
    • http://www.tobywells.org/media/fckdir/file/57311236385.pdf
    • http://gr-chem.com/upload/files/43922709651.pdf
    • https://ekoelprom.pl/public/images/editor/file/45681037710.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/93625232874.pdf
    • http://macierz-grodziec.org/files/file/wedumotupuva.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xeritetadi.pdf
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/sozudumizewulem.pdf
    • http://paulgraphics.paulsfashion.in/files/fonukon.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1cf11b6b7777b05eb89655ee7b470682/66939008389.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/pivelujasexuju.pdf
    • http://vandientuchinhhang.com/upload/files/kadilokaroveposobunidix.pdf
    • https://ckmandarin.com/uploads/29435061807.pdf
    • https://rowsontw.com/shopadmin/upload/files/gebinetogapamurerekimofa.pdf
    • http://filippodelvita.com/demo/userfiles/file/22803783895.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+russian+tv+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e8.bin
9cf751db1bcbd85d98132082d3d26f813724612a0d9aa43579dbcb4158ce8eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 17324 bytes
font_01_sfnt_off0000f2e0.bin
a8a685223e732e0d23ff8db12bd76d43333ab9fc2146f9a9caba09df8e3efb3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10664 bytes
font_02_sfnt_off00010b7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 16792 bytes