Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21645727a2bce61…

MALICIOUS

PDF

92.7 KB Created: 2021-08-19 16:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea76f9ddf5c071cc0a8f9bb0f734310c SHA-1: 10cff13951f2244c1ee0ee4dbbdcf69f8606bbbd SHA-256: f21645727a2bce616e904068a613f14ce2390eeda47b664d51769ed7ff1af666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs indicate an attempt to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=ficha+tecnica+de+la+prueba+del+dibujo+de+la+familia PDF link annotation
    • https://paperland.bg/uploads/file/51419310730.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5172c1f3b---21751845927.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6ac686f2---37171399658.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee77433e1---69850670470.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/84353374446.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/15099706815.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/jegojisasowila.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e4bce61a08ddd82e5737eb300660c629/vigij.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/gutovifutelitiver.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dejanuzu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f9807df0---bajatitibome.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071eb2fd5e---44497059219.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/geviseto.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/81758fd1d8f01f2b7cc7477ba0417202/56985657092.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/bivagugosagonojivatewab.pdfIn PDF document text
    • http://simonide.org/userfiles/file/13721326703.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/bagatagapam.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa628c424---6140393557.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/9283636027.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/56206899901.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/xaxib.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8781bd914---vulofap.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/fubalafexagaganavetane.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xusezumavatopapiluli.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_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 17964 bytes
SHA-256: f4a15322504fad48aa4c1c2dcd8cc60258ad47ce65579f4c4281ec584f00d590
font_02_sfnt_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 11064 bytes
SHA-256: 189e1a83a39ef0e30af03f9a266708b1f50185f74863abb143fd72e0e6e21f02

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