Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb58e911031e68c…

MALICIOUS

PDF

94.0 KB Created: 2021-07-02 23:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 314db264a3425981dc7baf1f230e02de SHA-1: e871f59d1cab0d3ad21a81fbd9168fda48c2307d SHA-256: 4bb58e911031e68cd954ba08451af2a4538ce59f664018124e69f45315b84d68
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fier-forjat-valimet.ro/ckfinder/userfiles/files/rebululasukepaxumogi.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/75426d339f3bd30c48833a0385887876/51017889612.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/libixakilapunejud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4d34e3f4---67441059026.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/davewezibapidote.pdfIn PDF document text
    • http://msiutilities.biz/documents/56399305848.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/wijarusojanukixofekefegan.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/sosujibitejokak.pdfIn PDF document text
    • https://atl-50.com/files/file/rirobaguwewafoj.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/85260712495.pdfIn PDF document text
    • http://renovator.cz/files/file/5381247250.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/57323279578.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf67dbd05---72809476586.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4a23b715ddbcf42a7feb1d105c401edb/xulir.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609544a00b539---gesebiduzazinuwafagi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/02e6415711af67e57c1d642935bc734e/lafijufibatotugusunos.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/77e13ab7388219dcdc981c2f9e60ce1b/patudanizozotopazo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/f94u46q0e0fcubjob7afi6sk46/2177407099.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/wogovojeziduwoxok.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b005c381d69---2389529962.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba8fbbbdc3---newofanuvulupalikexaz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608924baa39f0---gurubawojogazuk.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/vapokikurago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=executive+remuneration+meaningPDF 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_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 16860 bytes
SHA-256: a66abb70bbec33e89196f60f2ad45a4880bfeec66f400444739f4f16b4d01a86
font_01_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 10612 bytes
SHA-256: eb4b37988f249a331bc51af575c93deb7d5ad965dea669463748e76308996ef3
font_02_sfnt_off000152aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1