Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab08fb7d800b83c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 01:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25782f36f27741ee1769b7551419c874 SHA-1: 49e468e565439b7427d932b143e08ef52d472cbe SHA-256: 9ab08fb7d800b83cdc7e6a5e081f07f93b225ea2f6720b954b3819b68b8aa521
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to execute malicious code or further redirect the user. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://laser-piskovani.cz/democms/userfiles/file/suvamozodunolaj.pdf In PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/xobux.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nomibonajomusijar.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/pevurubuwox.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/miwikijof.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd94223258---porafugesuxesimosewomofe.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/28350549764.pdfIn PDF document text
    • http://thongthien.vn/upload/files/vofovurezobituxonimulole.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/vubevujatokafoz.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/luzinumaxa.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/73729659740.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jejijokojozipapozedete.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/jemogazuwufijixinuko.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/demapuvuxupunu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/bedunewikex.pdfIn PDF document text
    • https://tekartltd.com/upload/files/82021851258.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/79983040164.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12d44bb6f---nakirafanogavapegegaxezux.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/wujowenorupuripejilizalel.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b8b0cbe6---bekinolesumirinatadosime.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/62834141488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=giantess+games+for+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_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16740 bytes
SHA-256: 3f49dc89dce1ea51cf08ce2a822642bc7b99f0138181cbfac6887d04d1a4b3b1
font_01_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 10688 bytes
SHA-256: 858d3d03c2c23cae34befedc48e4d5f3355a19b7bf6ed1569ee8cef5120b2f52
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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