Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93715666e16a96…

MALICIOUS

PDF

92.6 KB Created: 2021-07-31 17:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 850ff490bcef97902b47f6f3e1a6f803 SHA-1: 7d78b94b777db5ad63a3f68a6041fe7c18c3e4f1 SHA-256: af93715666e16a960f80098400b9c09cc34493b4e7653ad76ac837a12e5d6cc8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f571f41375---bopalekonelavil.pdf In PDF document text
    • http://plafondchauffant.fr//img/user/file/82899647017.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210624104901_rtzsn2.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/muxurugexometato.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/56fee17c155185112f3ac5b87bbee728/sefob.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0baa6ad1ba---8493335655.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835450d80ad---jinitoloboposuxid.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/jivosaxawisugalex.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/921bd755bfb566123cf7d4c9ffc8ef41/74284961207.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/84116120859.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf49dd3b4d---jebugotoxifusoteza.pdfIn PDF document text
    • https://pindimana.in/uploads/file/dufikopedugevad.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48b6c9306---82807779136.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8e9ca5b5---32852770354.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a597021eb1463d82661f8747371c1bcc/42540522038.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/85117455117.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/memofupovazujixomofesumaj.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/67817823024.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/40393626923.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/69065269278.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-26/20210726115313475631.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/94182180497.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/p91ck3hnlpqapt850d2353ski3/vares.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06c228bfc---vinajurewidomeremusanud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=core+java+multiple+choice+questions+with+answers+book+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_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 11676 bytes
SHA-256: 75ce776c87bde15cad052c98a16cc80e5467e09cf6768063c8b3a2cbf3b297fb
font_01_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 17608 bytes
SHA-256: 359085ba7b789cac026e3ced19cae90bacf6c0feb89fdaefd7e6c760859d0b0b
font_02_sfnt_off00014b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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