Malicious PDF — malware analysis report

Static analysis result for SHA-256 36baa4de7dcc23ba…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 15:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed1b22e5edef4bdd8a7d472d24c11d48 SHA-1: ea96aa3d3196d009d8b1fb06e9a4c09b6ce5cbeb SHA-256: 36baa4de7dcc23ba7c11fb1b276658eaf05a94a2f83508551584a65778812b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://laborke.ru/uplcv?utm_term=cheat+gta+san+andreas+apk PDF link annotation
    • http://sewakendragroup.com/userfiles/file/zunixikalu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/348f6f332cab51654c5a4cf3d0d397a3/motavo.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210909095812_wapcv1.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kabegulez.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/48544926371.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f42299ec---11776081382.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/58695373810.pdfIn PDF document text
    • https://italvaping.com/file/zevumewurak.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bapotepipafekumik.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/35823817435.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/fotagibunarufit.pdfIn PDF document text
    • https://cubic.is/userfiles/file/46246744494.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424e56e67ac---mizixopexunobitig.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/rasukem.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/49209386875.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/xerapudigenilozaju.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e989ac667---148577752.pdfIn PDF document text
    • http://e-district.org/userfiles/file/66782824011.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/15881114676.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/29220547453.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/sesevopudor.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/25000899850.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/57314694410.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/wijelizulelotajawaru.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/bugilemame.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xomotimin.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_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 10536 bytes
SHA-256: 5fdd3f5c925d9052793d7420e9251cc50356d9ab723ca916ce4dff6b2c72594b
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 18044 bytes
SHA-256: 9faf2d7fd6daaaf803c9f473d1cfada8d222a640c73d51d2aa1be673749718df
font_02_sfnt_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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