Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3d2c7f634a594e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-21 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 278494b9ba3c24764972014a5948133e SHA-1: 1e47bf26fb8bdf6d18055a2ab5a4e0956583edb9 SHA-256: ab3d2c7f634a594e7715f9382d6478aed1b58880df2d7686a438cce699b0d945
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 uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=lars+von+trier+the+boss+of+it+all PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e08594662---miwafuwa.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jilejaneluwafopu.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/tuwevuve.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162e5ae970---79735956735.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210904180655.pdfIn PDF document text
    • http://asqcert.net/files/files/91338652979.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/gubeturibez.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34894616894.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/jovewaravulotimexa.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/80958668383.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/belufudemurimexiguli.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gijezaxonodoxagevafuxab.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/zebaliduzurizoditikiwo.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506473649.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/ralon.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/pufarare.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/98535589283.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/resakolasog.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/vopemomidof.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d660617f8d---dagirepunowomuzutoke.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/62157970707.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogazudazumidikukim.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wevaselegidatib.pdfIn PDF document text
    • https://brukspec.pl/upload/file/99005695206.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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10476 bytes
SHA-256: 2849722784912a95b588fe76c2217b46d846e69943e7967deb1521e752df2f3f
font_02_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 20332 bytes
SHA-256: 9061f9a7f12cdc347adfa8d59131fc15eed5e4e5ceeb5d7e889f9755c7970911