Malicious PDF — malware analysis report

Static analysis result for SHA-256 5843e25995bb55a0…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 19:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f1cfdd8c17e7c6f025c31af54ff95098 SHA-1: a24e904c52b5b8f684f1791ea6a58372f0dac609 SHA-256: 5843e25995bb55a0962c275df7ce3e30cb9cb96d785eaecacc251b2a9ca8a910
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to lead users to external malicious content, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a33c34263---filagiduxumijubebokotizox.pdf In PDF document text
    • http://tribo.kz/userfiles/File/zonunonubesexalogom.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811b7383e95---kovonutitukiwikapasu.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/vitizuduzufaxerik.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3ilb3qg10quc9hf0870ome1p85/zogugopetanul.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372eb64cf7---99841632524.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/fekumoxesukutiwobemuwa.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2b6b7ce664fe8efe869f7b2cf18ca268/76831950936.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202151092212814.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608799b1aed00---viturizagotogopibuxutato.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062107013690.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad03d24cb86---gezaladirutodo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/93e5718dce6a5f27360f79dcc9717e11/gexugowisixo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687ca4ace7---80916173624.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/bejuxoxotifamititiluvex.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/pveo9c4roopo379r2mr1e3vnk5/didejabafuvixiwurironinum.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106100354353378.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/vawanisoposiwupujuxagide.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/fewinibepeduvuta.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/60172952504.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082b840e0dbf---jokitodol.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c4e26d5b---bijuvijigavajubogam.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/938b42ada5r2jsqb2d7kf660g3/winixixajepabatibevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+quantityPDF 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_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 17624 bytes
SHA-256: 2997463427702200210e08dd744b89f47494a0d6baba0da79d23069677871a26
font_02_sfnt_off00012dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10664 bytes
SHA-256: 623c881c8a8c17cc73de37ce0098827e58fe61ecc7251076923d8926c04da762

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