Malicious PDF — malware analysis report

Static analysis result for SHA-256 927d9f2a791273b5…

MALICIOUS

PDF

63.6 KB Created: 2021-09-03 20:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bedde21e8e96579b4e7e8e0357965f66 SHA-1: e9dbc8afd6e2d5a48b530177cff97553a0b78fd2 SHA-256: 927d9f2a791273b5e9f76df8a93dd5bc2826bb04c2da7b9a17dd72fd3e83d74e
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to direct users to malicious content, likely phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

Heuristics 5

  • 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
  • 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://newsru.md/upload/userfiles/files/betijesetuvalutirota.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160898e8551a37---vomodiseboboxibosevud.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/tadafekazovo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/dupomo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ede28857bc4---88190723141.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/59026281855.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/kelunezadapemupelumolif.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1aca5b595b---keselimuxinusiboroparan.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd970adedd7---96638613646.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/konepo.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/10656861779.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/6024209109.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/ropaduniwulepemumenup.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/84552966413.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xexifobojatuwamasajoren.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/59894289083.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d94990f8b6c66c73ff3091f60974ac47/51445459194.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afa098128a9---38270805126.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768f0ea2b13---92975997216.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/10888985329.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607718dc1fc7b---wasidutapewimiwuwujo.pdfIn PDF document text
    • https://dintek.eu/uploads/file/bezadimejelizap.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6qp950ior5m7gd22qtl7u7g53/jaguxotarikag.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ee7dfa36ff9d560b4c5f954261a98930/65690915953.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a04ca97a---minamejelejexuwifobidex.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/10845396312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=estudos+no+breve+catecismo+de+westminster+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1