Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8ebd25542eebce…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae6625594d8ea9d24ec1ecf0438dd81f SHA-1: eaa2732a540cbc902a85ad46aa0c39b348c864b0 SHA-256: 1e8ebd25542eebce56f0bdbf12e5eb2141e64a7b60c2908a0d48a2c4b1d5faad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://eletvital.hu/uploads/files/vilako.pdf In PDF document text
    • http://kubkao-kubpla.com/userfiles/files/53318927589.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/19898028603.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/denebuvoduxujuxubuwul.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/74039539203.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/jaxapulas.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/maxobeviwowedoguzatomuwej.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ab1a282b---82356215549.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/dc9753b642b2cb58546e3483c4572d77/2268070343.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikanonufiborelag.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f0e33bab04d595d0f4db34edc9b29d5/gejixigelavitatudotonoko.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/596g7mrgjj6hbi1lvnt2m1hjbi/josovivezamuber.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/bogupasisunorakiwitujes.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035611914a---fuvatelifawazepega.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41400aed9---85966561597.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/55646780175.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/68180623781.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0e3e237f---noroguse.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/fiwutebisatapafa.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/97372658741.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20659313698.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/54207680746.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/87739890954.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/ligegekog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=modified+bessel+function+pdfPDF 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_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 10584 bytes
SHA-256: 693380e17beb083b18fc57c3e7318059e451a9fda59019dad04be27dc3c141a8
font_02_sfnt_off00012af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF0 21224 bytes
SHA-256: bd87bbb57235a26751b36bad485bcc1bc9799b30366d9dc5a659164b80254d13

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