Malicious PDF — malware analysis report

Static analysis result for SHA-256 af448630b2d75ce2…

MALICIOUS

PDF

180.1 KB Created: 2021-06-29 05:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd72c8b2892801c6ca79183764b36225 SHA-1: 40c95399ccc512ec1b1f825dd16856c96fd8b462 SHA-256: af448630b2d75ce2cb68084582244992384d3f59b6c6815388427bce189810aa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://nomylo.ru/uplcv?utm_term=thick+nuchal+fold+normal+baby PDF link annotation
    • http://mebco.ru/images/file/saxidurozovesapofukowuluz.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/81274537791.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/70620256993.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c77n2bs1afveijnd0tlv8quq06/zetowuxugi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/28917163135.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a278ca9099---wutapitevikutuzujame.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8aa03398d---79784959621.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/wezepikuvozevutusul.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c52a9055dc561af873cec412c9892c6f/giwisevoronenokefuguxo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091995cd63b5---sediw.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/98658167733.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/59782230378.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/77f65f28ibmcn81flhcod0f0fg/bazinokupukuzikajo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mejitoxopirogivopap.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/7q0gl8ufqfpasoch63a12bom9s/refurakodubes.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2a95ccefc85bd2d217d97333e276e298/88670889431.pdfIn PDF document text
    • https://aspirans.com/files/file/susutokekosakavononugil.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72b4053dd---32828625021.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216121512477130.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/90719835524.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609718fde83cc---61625997348.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e5057bd62---duvituwolizumumuzebelib.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_off00025efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EFE 10752 bytes
SHA-256: bfeff8ea6e481a21ad44e3db7240066d2f6ae838dbb7b9fdfd4e5b55cca2952a
font_01_sfnt_off0002777b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2777B 18944 bytes
SHA-256: 15d86598ff95ec3ceb442b248bc6c9785074cc7484d0b89365804a9c60700583
font_02_sfnt_off0002a923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.