Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35c6f6e2d7b53aa…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 11:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a37edf7014ebb1e9dcb0e89dc1eeb3e9 SHA-1: ac1e0c01c24df78f1db9854dc1cbfed6e2ca6159 SHA-256: d35c6f6e2d7b53aa25d32cb6777659299b3aa11a35ca5bcd665511b346a1c188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI firings and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ketchas.ru/uplcv?utm_term=puffin+browser+windows PDF link annotation
    • http://epilia.com/upload/FCKEditorfile/goralisi.pdfIn PDF document text
    • http://hncastlecable.com/d/files/86828221449.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099db389521a---sibotinebuli.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd68f6baa4---fuvonekitusitokiroxulon.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j914siflhcdlt6btiuv7cu0ne4/41205957275.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/zojetizubezikusuzem.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/73968763880.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/om5m17kip6qikb2d9ugcb0d110/kudid.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/falizaposoluxofipazebidis.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cb45b7d2acf75fe53c81673e1193e25d/barofisilidaviwi.pdfIn PDF document text
    • http://dentistturkey.com/image/files/88741942710.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/vofapelewogobofoladasowu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713e7278d9---jidegulo.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/poremejuvurevakelawamuxil.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c718a35b---16230646062.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/81352549099.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nc4r3kp3hsi69ms327plns9f07/25376678216.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/81632130849.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///57991752227.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/717dd62f1874b091ff2cb10d19580680/tezuburamegujagabojewag.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/26947650220.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/4981046896.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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 17268 bytes
SHA-256: c4c2bcd19fd8ce939bf659977d958cd2810058e834c6291aa8ae24379d2bf8d3
font_02_sfnt_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 10368 bytes
SHA-256: 84b71a731f0f3add6bf6dc4c038166c3045d8215c4baa2f5310d8e93be00cebc

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