Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5483f2d1785cac…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 13:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fcea8bdb1c4191854c1875cd73e0c2e6 SHA-1: 54a59a4fcc403abd8d5dcce88406be9399b647bd SHA-256: 6d5483f2d1785cac5e08414a0ade8a3f387ca8b94424e6fcf21b95150ee86c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware download sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=mr+badger+and+mrs+fox PDF link annotation
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ti206fhc7j95ok4kjdh9ehogvt/jamebokem.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/urs26n9hm31hoto44dk6iucock/dovetokowes.pdfIn PDF document text
    • http://artospace.com/pics/file/xonaxubavovojulisuxur.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/89355580424.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/4747685621.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8c90031a586ee00db2f368ebc35eced8/lovulaxitewafuxol.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jajofonepiforufu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ffbe3c611ce144ad8873a4d747ba8de1/mutonedaxagutukek.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9dfd5715---35641224006.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39bb40a03---newojerumudepuligig.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zataperapiwusemexama.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/7kajn7gnf1a5vlesng4umu2hmq/51906985895.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a4ca5d811d2c7f88d9df370de25d14fa/82931601335.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3960d241c9---54105212633.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/mcb9790ds84u98pmkg07ucf6rd/wudute.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/rutasewa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5e42871e0---4378124456.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/5ea7f294345121db97e96e3ee7e44bac/81143856216.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/bikubulibi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2f233216623b3332444f65b93e3a62e4/26643951197.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/29579815788.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/lr7705hepelhman0obaf0ep43g/nilotimimasipig.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/010d335204eee80381aeb2d01de9286b/79901169542.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wabudaxobaxakuxidejun.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/gawisokulutimeb.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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 19248 bytes
SHA-256: d6cfde3db85c735bd7259adc2e25891a92430cc7889f2d8e83a466f52fba3d17
font_02_sfnt_off00014406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 10696 bytes
SHA-256: 917f2a6731bf07a6913ce1be278770e0ae5c7fb1cfd38d2594b7257c023d2a3b

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