Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e5319fce766cac…

MALICIOUS

PDF

77.1 KB Created: 2021-07-15 15:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 060647752753c6d68f338670de450dac SHA-1: 8560d9dcad6db442c6554f32c8dbc344628b0971 SHA-256: 51e5319fce766cac5367fd298d3c9dc587050ac3a90e0aaa7f8d185dd61e0922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to what appear to be compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef075472d---47302148484.pdf In PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/19157122681.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/lofexataza.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/21955633751.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/22292626825.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9024d2395---12066559020.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62738406878.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/82325664760.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/df57cd2b39c614dd69ce62c03ae1036f/maxawopasebizuxaduk.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092890c27d4f---76896819420.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cf9dd79---dabetakisajunutovawop.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/757926a55eee6425611e640c28c7e8f5/naxevebanutikutako.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082989969eac---fabexalizafijezujazir.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/pugiwerazubiki.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25fc7e351---wezigoxur.pdfIn PDF document text
    • https://loctra.net/userfiles/file/63426728664.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc81235aef---64938558213.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2dc7330df88b1ac604496cb2b70faed2/43929125164.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/panaka.pdfIn PDF document text
    • https://vitecolte.shop/file/kiminuzabarilinevizarin.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d45e8b06c---46283629053.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/moxefususogivejivobiwate.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/lidadebukikalanibuzaw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c30780c7594bb71ecd760b4a0d784058/64137832274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=neural+networks+fuzzy+logic+and+genetic+algorithms+synthesis+and+applications+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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 11496 bytes
SHA-256: d5d5d89ffe75d771483dc65e4d3e663150091f9bffc9079c950560c308de0a2c
font_01_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16612 bytes
SHA-256: c5f3c31100f33e6909b4aa31a56920d3efaf2e3d94c1f87a19c18c721e578a47
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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