Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc38841f8c426c7b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 16:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b64aa9436a0c09c9e67b1c8ae72fe8f SHA-1: f7a886f8d72ee28755df3614187f05bfaa94d443 SHA-256: cc38841f8c426c7b0e785816b97de9e7cc6e6456d756fcc56952ee7694b1d04a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=top+ten+free+movie+sites PDF link annotation
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/gowotixofefas.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/zapejuzot.pdfIn PDF document text
    • http://thebottombillion.com/business_school/uploads/file/nitojiluvukejewagonena.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/25700180614.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210913_574530AB7319B1A4.pdfIn PDF document text
    • https://lordoptika.hu/files/files/57620789057.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090517535180554.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/29230853773.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/tarepuruledali.pdfIn PDF document text
    • http://belst.by/upload/file/rebaxoxipududunoxagobu.pdfIn PDF document text
    • https://tivicom.vn/upload/files/tazotizelunuxatopuk.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090912085766.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/18317926363.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/42b9e20064263092a93f6ede968156fa/tivenegufudowizazixaze.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/355422309.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/48846297768.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478d5308b12---lululitapopepijew.pdfIn PDF document text
    • http://packamate.com/userfiles/73030847532.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/30291885012.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dukesixadaxakogiweranofi.pdfIn PDF document text
    • http://wawa757.com/uploads/files/zakabux.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7cda0127---valitolutivojeze.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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 10340 bytes
SHA-256: 84ab2e28b0faa85a627711ed12dbe094afbf098160b77a03b42395ded368e2ca
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 17060 bytes
SHA-256: 38aa7bab9e54aafe8985d9bd5d7c76a1bd9865e71487b28c987bd5a63712a249

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