Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6fb7daa625c602…

MALICIOUS

PDF

75.3 KB Created: 2021-08-20 04:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 80055a9b5b68594dd21cff6cd7e7f591 SHA-1: 9072aeb6e6a7e9380080a2471bd8f3c9d6400bf1 SHA-256: 2d6fb7daa625c602a772bf0eeec73a4c4b3349433d76aa579660808c92667817
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of multiple external links indicates a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=what+is+the+empirical+formula+of+c6h6o3 PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/prbuo4v2abh36sd8nj1phv6dhc/16050140800.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/nibosojijobawekufajisek.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/53717420977.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/69305401446.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8e441e32a2203173a8bd5f2d1ef9ccab/19945578653.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/95679323969.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa7dbcb56---basowin.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5253a961---97332525208.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/suzuxebedokazo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e311f3cdace0d7c171093b6abfb36696/wibemimokutafitogo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90c71f431---56323175016.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qm0qi834j5kithsh4ilidlqhn1/wuxefojetesilepifir.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/vakilogomefoburox.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609630026a6a8---bavifawinalu.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/18572702658.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/59429870530.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vokixisusurilejosajakube.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/sedupopuda.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0e20e66d---86741493968.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce46cc43c7d---pepimox.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/razivumelipukivozata.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160748fe72fe74---fawidopepozorujenuxasun.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/96409989422.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ioeegjvk1duqpehncbgf3cdh94/muniremorufesi.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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 16428 bytes
SHA-256: 383631125d19db662d8eba4cfe6e87778c4be9903d4a55844552ea445d19c5c8
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 11072 bytes
SHA-256: fef0dbf119d92c3cdee8480566b7a8d62feb2ba4e248803afe4376020950a246

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