Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a05c8cd9be261e4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 15:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c975b0a65e3a332456a554461bda7a4 SHA-1: cfadbeee643c1455b8947f1b66e46e631916bcde SHA-256: 1a05c8cd9be261e404262a4f3f1612bc37e85f6c6950e58a9544919be16c1721
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=download+nitro+nation+mod+apk PDF link annotation
    • https://ww150002.linebot.net/upfile/files/20210904015946.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903140105_npdxbu.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83847979189.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/jixabobomuton.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140126b16b3f---rijukodukitawevapigovi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380a4bc3b71---29030379687.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/18399149485.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35882f7ee---76248294156.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50354839459.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/60334716458.pdfIn PDF document text
    • http://net-marketing.hu/images/files/77242049740.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xezukidupupudepituke.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090717095670554.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_190313.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109020724014251.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/90618149691.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/tegakebiradodula.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/dinazanuxere.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/56331611978.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/1361016287.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/72072823023.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/65044406213.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5b1a97fba396a663deb16870ca890314/xonorawubebog.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5ae60b63---tawezobitev.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/8474077867.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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 19828 bytes
SHA-256: a89bc2c4c8bd06e62b48afb7838245e44c11caedfed89809c77e26c3bb491201
font_02_sfnt_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 10432 bytes
SHA-256: c8e3d485d3147740268cbde94656878e0125287b7e88837d87ae59e838cc2bdd

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