Malicious PDF — malware analysis report

Static analysis result for SHA-256 4291ccb37e57e026…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 11:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f9c4b7f5e96c51af0feacaf15acd911 SHA-1: 9d9480d82bd442e2372dfa05ad0159127b32b025 SHA-256: 4291ccb37e57e026f4e8d66394b2d4455fe9161092d20a6fde102b592d5c9acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous external URIs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=how+many+irrational+numbers+are+there PDF link annotation
    • http://chi-kara.net/userfiles/file/sotiromixewir.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/u5cek3b4l0hbcuas5tlpmaj0jc/42119048206.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/bisitibezitidoduk.pdfIn PDF document text
    • https://o-dance.com/upload/files/zovaromebowurupovoworupez.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/wolesegaf.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/35483569324.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fujotuduzusijekiri.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/6e0a9726ad654038de3a6dd8a0220baa/makuwonagakitoloxuk.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779fff95a98---49957642756.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79cb806e9---vefozagasoxutigej.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/093242cfc9ee56f670872eb7a3e4b164/nedozesigejab.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wonokasebekafoxexad.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e801e9f7b9---20921504225.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7bae06d19bdd0084cabb0be66b65645e/97241747165.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/57837112502.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6c6b0d0f538b79f5ed032378263497cb/rajagutoj.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kisuwegawunewotelos.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/kelurano.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c59cac8114030787e3cabffd19d8f2f/37899539065.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e7e142825---xaxazadekinoza.pdfIn PDF document text
    • http://gardatrans.com/content/Files/20798629993.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/voguwasopapeme.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609030147c798---97124792186.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/edf79jl0o464sbc8hdhdogri87/pinefijurivabetig.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a14f9a0685f834cae289b585d4ee9fa5/19548108144.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10804 bytes
SHA-256: 2581ede30d4d63ab42a6d9b742cdaf8d9ad21300bc013a5f63c3ba3581fb0e88
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_03_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 18196 bytes
SHA-256: 4e4d279c8a38e19941377411c9030504b07d0fa9c24ae5740889f9a05929cf69

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