Malicious PDF — malware analysis report

Static analysis result for SHA-256 53810bf2f8e29d2d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 11:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 63e36c6c37778d6d5f652ff1c951a2b7 SHA-1: b5b663f8f9270902313bbb138cbe07e3b032c5d2 SHA-256: 53810bf2f8e29d2d4fa5f5c1d79679a26fb9844964cbcf80812e29d8bd3b416b
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pokemon+saiph+download PDF link annotation
    • http://tbvshungviet.com/upload/files/91719893584.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fanugogezifimepukotaza.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nurejugipiz.pdfIn PDF document text
    • https://bdata.vn/upload/files/5647440863.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3b9f51fbe0af16aed32da7c93fb0279b/86556513080.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d5826007---xuwijoxofavixapud.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/82825179847.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kunibajemono.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/46630026870.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/81922725229.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906213236221908.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050959367590.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/xagewezirozov.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613743742cd8e---92693200749.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/94236958722.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/62211381205.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5tl75p0pbknrsj01e3ibp0v763/36957127054.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091417592680554.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/71887861953.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0acdd050311d7a6bc85bd1cc057600f0/90071097321.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vudisolejirijeril.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/basaposesasigaxibusupeba.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_off0000d9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D5 10640 bytes
SHA-256: 850dfe3b680621b437545b75176edfa02f7f05c71aac42a570eb8a3dc071ee0a
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 19516 bytes
SHA-256: 4bd4d31515e4d4bf75f5bc42bfb2891a82dd1ac4939fa04e13ba9b38a235c900
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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