Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8752f7de69cf766…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 07:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ddd9274df1516d5ba2fc9dae9460ac4 SHA-1: e07471ba5def8d694179ad74fd08fe86a1b32791 SHA-256: f8752f7de69cf766621155db1a1f8c9acb759c766a71f14519807c18821fc62e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the true malicious destination. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its content and intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://langumeistras.lt/i/File/dejusuwedibuwatoxo.pdf In PDF document text
    • https://menu2uplus.com/images/file/gerutemulin.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/xekisikoserefaforomupi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/namon.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mupujekajuvalimuk.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/99770247368.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8ed092dc3---12934053652.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/895945fa906e2c073d4e3b510e763e9b/86639979443.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/71587835257.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/denisavepodo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108887c5d964---bejovunuvatezelikezir.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de8762bec27---88078880884.pdfIn PDF document text
    • https://hinaweb.com/upload/file/gubobajeporeragew.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rekuxixizoperi.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/51512822494.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kogagadopinovu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9df5f35e0---90244751008.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c290b9470e8---95595671021.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/nuxazosukukedabuzopuw.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/bojubonexiwalojivikabug.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0f6ea8392---dexosobinelemokojodaj.pdfIn PDF document text
    • http://hadt.vn/upload/files/50423896663.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/sajuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+is+primary+and+secondary+data+in+research+methodologyPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24F 11068 bytes
SHA-256: 151a03ab460d31e843c30a57f1546cf196891fdf5f0f0943066467c07ecff6cf
font_01_sfnt_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 16120 bytes
SHA-256: 46fee311092a30b04874616f28b1b3106dcd66ee2f67c23e9f66acf64128ad90
font_02_sfnt_off0001148b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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