Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd82150bd4e31f9d…

MALICIOUS

PDF

98.0 KB Created: 2021-07-16 10:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ac7c974b44c904e26fe6545a714db63 SHA-1: 2bbf0c04915461d18db034a0823371a2d6d730bf SHA-256: dd82150bd4e31f9deacacf61a5edad6ae8a8723b7b470e0b7bf8a90bb09217ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm indicate an attempt to exploit users by directing them to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32bc2af21---gebozexosimofe.pdf In PDF document text
    • http://riskhedgetech.com/uploaded/file/193448300060951136e1891.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c5673595---renegopidiru.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/zolosivufajadapazivizobo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609844d09f807---jedixijejizol.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8cafb8b76993d9d71c9a304f3905c67f/kakafusa.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27018c2fd---nonimulevuganovomuwabu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/27cd76054124ed54afadcbdbf4b44c67/xofaxoniwufilezazek.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/mamewud.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e13189a4051b00366290b3e34e84440/58488751022.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/tuduginukonaf.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98c7b46db---7011036665.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/erhbfrdbnas2ns6v5ommrirs8e/tararax.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de70ef5ba---dokumu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f55c3314---42110460880.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/46894804482.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c97e398b---62330207950.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/mopalevuxoganuxokofagi.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/fafejalaxabogafupujunuxeb.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/28582345401.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/fudusoxuzomoviveb.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18e871552---80903462563.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728abe37c57---debobijilivivubawusatexup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/11arpdmiv1a3k3dvq6f87lk9ja/wosilebib.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609270cb9860e---fiwobase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=table+graph+examplePDF 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_off00011e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 10320 bytes
SHA-256: 86ed71282b15c6f5737331b94fd4702fabc87ceddc5af18aed168cb3812c83af
font_01_sfnt_off0001357d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8F 17464 bytes
SHA-256: d23c47763a6a026dcd8e5f36b9ddbefe9685a7dcfaa30a0516a23e614cb3a4a0