Malicious PDF — malware analysis report

Static analysis result for SHA-256 e894b1ff36331c49…

MALICIOUS

PDF

92.7 KB Created: 2021-08-11 20:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f031fa67ace295dfc09b099f57e3d7c SHA-1: 75eb8d0fc867c524339f2bf12d1074a986281a64 SHA-256: e894b1ff36331c4977a0839fa4a44946fba55a84e89d0478c15d8ba6508ff6db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on potentially compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lienlacanien.com/img_pages/file/57689691566.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f0e93613f4ab3d495aac9759e20449c7/32387617933.pdfIn PDF document text
    • http://coffee33.ru/archive/file/86066959968.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/puvebi.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/kabaz.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/67945514147.pdfIn PDF document text
    • http://szwygs.com/upload/renire.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/03af027f100c82d945a4c44e8b2ef92c/26890969589.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084851eb87ab---30383805478.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ltu7djdvikueu75kaq11aelgcs/rorodetutesuvabuket.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/lagenunud.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/jerawitoresumovitufumibol.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vawilofuvekid.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a497868b---boroma.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16079e5959bb6f---nejar.pdfIn PDF document text
    • https://ikansambel.com/contents//files/39443323505.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cfe6aff6---gutezag.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/zerapojatulub.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kisuka.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/lowasagixotojugukozuw.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/d1qtpaecoi4jbdvup53cm5fb3c/22541353198.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e45e8363---lekujobanalimelurap.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/debuwajosazefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=exercices+sur+le+pass%C3%A9+simple+cm2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16144 bytes
SHA-256: 7384f78f7eee0a7747af6aa54f6a012ae917b773c3daf511a94379393b43df11
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10920 bytes
SHA-256: e4345c7ed0865a6285c25c40e0dbd5147b45c2b1dc28b42f748f61e1e22d5174
font_02_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 19156 bytes
SHA-256: 836bb078b9b46c1868b463b35476eb8219c869a75cc88c9c3525f0a57dfb0afa
font_03_sfnt_off00014920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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