Malicious PDF — malware analysis report

Static analysis result for SHA-256 5085b20755eb9392…

MALICIOUS

PDF

82.9 KB Created: 2021-07-15 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a8e0f897de113a88d4daeaedc96f4f03 SHA-1: 4e49b73d30546c7143a8ea1d5a11563ba3a94060 SHA-256: 5085b20755eb93927ed95cff97d9759d63b472c2160897eef264d6acd8a0675e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=2+qt+to+cups PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b49507743ca---lagimegudipewabov.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/36494468594.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095a435451e9---98125469898.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4a3b7fa6d1fcac3920419b19eb227397/suxinabavom.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc9382d1---loxemilededakixagu.pdfIn PDF document text
    • http://maidichike.com/upload/files/doximadimogax.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c87fb6420---livarusose.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kjtiucbqsc7glnv48or6mn53e2/97129903888.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfbae57d67---duxutoxovukudevo.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vuvakinulajofubudi.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xonesiwilapol.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r4j880nu2qaj0h49si8kda13vi/tatewipep.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/8557354135.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8a10b5ad77b6281f82594daa827bc24/vijevebeduv.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/wafaponidij.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8ttcbovd6fe8s1m4j5jf7nabb7/4362673115.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1roic649mb4kg06gqgmf986791/soserusivumubajo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20764180057.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/14244857875.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/339e6055f24a935260ac93bfd69cca67/pekagumak.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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10000 bytes
SHA-256: da466c7d0ae3a78cc1da3abae39d1edc86d983e96b7901948dccde7bd3d6308e
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 16408 bytes
SHA-256: e9cf762abe37e495da5ce9d79462f86ca246dcfdea2789fd75bf91b8fa0e2bf0

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