Malicious PDF — malware analysis report

Static analysis result for SHA-256 813bf1dbb0b7a4bb…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 16:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a54b3bf7a7d0d5ae10edbacfcbd5d33a SHA-1: 9d6a995d0c00559bda6a4d568039493e9733df6d SHA-256: 813bf1dbb0b7a4bb4b5c2c2dd157e7086959a3ed0a5280a729831fe66842a79b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crysiq.ru/uplcv?utm_term=free+animated+new+year+greetings PDF link annotation
    • http://wernitznigg.at/files/67158933108.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5b398a11---sonofupakiberek.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/64045969699.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/raxetitabuduxok.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dbd76981---rivopitase.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/86702395726.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e7f4ac931---50572153919.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d237eef86e---86155211717.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oon4abiu4e22l5vrbpufm9tjbe/27731997905.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/067a14df93a9b411bf9c63531e18dd5b/fuwupekevifopaxapifubuxi.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/36425884314.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/15440048398.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/jasidejizag.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/sulusewir.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/35631570072.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e25c0074b---xadovenevumelejavu.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/xeligeve.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5141bbb11---63908016942.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/da41748820088ef17ef3baa2e51d5c1e/55275296594.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/63453087078.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/dca46bbae84f7a6b53f65314a6de8355/kaxofopaxuvu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/89f2251ad85989c6d035e1e095d6fd0a/jafixizuralulalo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9f828d8e---bezuzov.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/26467618315.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_off0000b983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB983 14904 bytes
SHA-256: cbe60b80f0b514d1d75ab079da86d7d40b991930f77f1ea280722b90b4a9a9f6
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10600 bytes
SHA-256: c1b0bbc199e1c7941b63b1e3a50be7165a6ccbf30d08dfd8fb0ea00f2e9a04e3

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