Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e18d1649236d1d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 253f17a041a4d7f8b34fd2e4457348dd SHA-1: c4a76c264a36c119f53a767ef7a551681dceb950 SHA-256: e9e18d1649236d1df573b30d1510efa1fa2080931f120656b11d69435319ac03
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 are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=os+maps+for+android+phones PDF link annotation
    • http://dzstock.com/Upfiles/file/93849203614.pdfIn PDF document text
    • http://shahgrp.com/uploads/pumumavobiwubevipusasufo.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/66398818983.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/26718813765.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lekudanepivobifap.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/sabofevakimapuda.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/862bf2c0e14dcd0c4904a29c3ef03640/83518902898.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wiguto.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2b9ab48660b82ef0ddde376161f400a/93908090497.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/jepidapodanirijivom.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/gasitotopawubafuvapon.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/xitexumevowugolemugawuf.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/35112207773.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/fapufejajuj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca700650d---25525223116.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/11214467298.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/36422164747.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sakamekonefe.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/lefibakabosikunagog.pdfIn PDF document text
    • http://pmke.cz/pictures/files/ziwibujowakokuwaduv.pdfIn PDF document text
    • https://migger.dk/userimages/file/vujonevepulet.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/nusebobalimujosagekuwadi.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/teginolatumuladuvipigazux.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/vubatuzabodatemuzizunu.pdfIn 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 18240 bytes
SHA-256: 7234e17596ab5a4d745740ec94491bcf8a9c8522707e4150d0f60b7a30d30a83
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10644 bytes
SHA-256: d78ab9db3c62ffaedec921ea4919c3376c1a5bdfd0405ecc15147e0ab0e26908
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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