Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab13b7de4c39a5b…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8c53c7027453be004ee61af40694f2bf SHA-1: 0f38352dd251992469786664124963e44ef758ae SHA-256: 4ab13b7de4c39a5b4330535f2831766ffad6b9d34d297d9d353270d3ca21a2d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of link farms and the presence of external URIs suggest an intent to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0059f6b1c9---kusebatapumiki.pdf In PDF document text
    • https://jamurgoreng.net/contents//files/22612693790.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6ee27d97---39602909116.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/penaradolefivoguridolepo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwemupizu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/letetariwuzopobisinite.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/85618311759.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tilapufelinoxatudel.pdfIn PDF document text
    • https://hoalavender.net/upload/files/98779614474.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863fde2ca2---93537318588.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4a68e55b---58489768347.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/dakebuguwutuwonawir.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/929807a514912a1512b1108b9dc5199c/80108151588.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/77548594221.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d5a9aa8dd3a68ca1099ceebad18d3831/75819012179.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a103d5c8a13---11176950698.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/mexofen.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/73fd7799ec0369c9d673f05747571dc9/14266610851.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/sewoj.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/riwojarozalidanu.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878cb590a4b---punelipategaguvupozupuf.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/jetevajutar.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/52130270228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+much+does+it+cost+to+open+a+subway+franchise+in+australiaPDF 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 17512 bytes
SHA-256: 06970f58537e09825cb5034da37e3165a9a08b4478b39c4a781cceaa507b76b8
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 11316 bytes
SHA-256: b37f746fec982cd491caa5c6e2bf4eaaa78c51978222ae8aadb366742f453f30

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