Malicious PDF — malware analysis report

Static analysis result for SHA-256 718d2ee32a457277…

MALICIOUS

PDF

67.8 KB Created: 2021-06-12 11:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e0fe40f7c1ff62096d775e4b89c1073 SHA-1: e6c32b7439b381152e9a7c2fbef2cbe66d4fb39b SHA-256: 718d2ee32a4572770da7f4e2208af17fc9e89ec761ab4c2854c1dc4c8fe131ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=beyblade+burst+ep+2
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/66342594773.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e95b3a87a526cdc1a27e04923d093fa1/43390892137.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc1607bf4---gesebubof.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d2a94a4db0ebee427609fd42b734b57/80751194647.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ef1d4bfd---29319565439.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3f41c5080---79010399683.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/0jn94frfhvt04gq2dhbnkk1r21/gamodudotepeb.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d418d18b0c14d337d0684e786dddbf16/60929028994.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784925f3ba5---lifofaginewebewifavenumu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/710783f5ee2fb8932849c6e9fe1b0c75/43851301153.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/447bd1ce64b110bfc1313fb70848023e/60469525645.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111d8be113---78826649720.pdf
    • https://vansuloi.com/uploads/userfiles/file/fesogi.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/01594ccb4caa15bf59bded72e150784d/16848822492.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98fa0d6fc---96243876312.pdf
    • https://aimhc.com/userfiles/file/jewidimafixolazamujenusug.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/n4vedh1da2thq29ikmolrle7iu/kevararazuwotoxabozu.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607567ddd0977---lofemekavevoketato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd2c.bin
dbec9517b3a9319bb2aa90db762168f481979fbb8c8298f20e8df889c46cf1fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5376 bytes
font_01_sfnt_off0000df81.bin
b2d267a9668122c272f504c812d2efc18a6f52090895f1a14b94841e1728849c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 10296 bytes