Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d13bb184863724…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 18:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 41ea66158659dce312fe19295eae2c82 SHA-1: cd1d9de33629688339c5feeda36b6b057df7ff7c SHA-256: b3d13bb1848637246f2790cdf08c2a9e6cb64a52ff069651eae76e1aaca818df
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to download malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=download+mod+apk+of+shadow+fight+3 PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e018bb29be---41801439651.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1ef673a1d545869ab065043317adf0aa/18663585336.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/86930355709.pdfIn PDF document text
    • https://cristalensi.com/public/File/96243821439.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/10779101721.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/tofapol.pdfIn PDF document text
    • https://avflash.nl/upload/files/90456549444.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/kunepun.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/zojogaje.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba482617e1---gesozuxuguwovetadasabev.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/48803373808.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131146631c4c---60878539072.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/bobedologevupir.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161565a0070a7e---90563011484.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dunul.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/lutejazawapazebiw.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/bapidorajavoralorugovipo.pdfIn PDF document text
    • https://jetaime-shop.com/files/zigolum.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/40784152734.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/89979669613.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/napol.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/56617453834.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/sipikofimuruxip.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/zevexenavegowazosu.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/48190545027.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_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 18376 bytes
SHA-256: ea519b0b80cf477d34b381beeceeb68732d7996fd77a2ef5ac902f0b59ff6fe9
font_01_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 11064 bytes
SHA-256: f21423014b905965992be9da75929be76d81307b5c6b75e3fe5f8ef585baa63c
font_02_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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