Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9fd76dc3be57ce…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8a55cb77e43770278480e4f4a50cc5e SHA-1: eb4c0d7a6afcbf2ded25439a926d7d17cdc0ed6f SHA-256: de9fd76dc3be57ce22c52599a7c2534a006a9a35058f45f5f38b600e00bd4550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The file's structure and embedded URLs are consistent with a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=best+manual+shovel PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/89749he2j31qpacmaj5r3cv9qa/71872116106.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dih71p5jl6rv90nhbgn3if6tgs/87737523912.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883d195dcd5---rulijabedifidaw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f2efdf211ff2b0c2f7317b7cb6da427e/situp.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1008ee36f3353eaf0aaef896647a1d0d/rilavitogolugozog.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/46570638197.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f41e7a457b47295acbcdad1431b00bf2/kilezodumagezesusopag.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/motusuz.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/92565344891.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/20211578143.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/70070239836.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121c67c6fc23---49536242413.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/webigexamegosonovako.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/wamatifedim.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/deradu.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/49878204364.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/lubumivazobugazore.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/if9c5tgkd71vs0l2occlcl0dei/duwunatojapuf.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b269007f2b3---88715720297.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/p646ajjtbd1kh9hfh73723j9m9/mizusimiwivekepovi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de3651c71---gojonexajobit.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/fawelifirowa.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4987676b300f98d38c802ebc6e0e4dcd/vipipu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 16548 bytes
SHA-256: 255f6b08e40c1a40980070fd9221951202176ddec0a8eaffdfa951b31f244ba4
font_02_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10400 bytes
SHA-256: 3b31f0e9d2fded5e0f862322de1d2646930fda73c46b790eab117f5525d09384

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