Malicious PDF — malware analysis report

Static analysis result for SHA-256 9351003b15f13986…

MALICIOUS

PDF

94.2 KB Created: 2021-08-09 03:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f315dc2c453e61f7b8d5bac37ea2ad5e SHA-1: a7b905cac6ea6d34ece38c8f1972e1df7f4c746f SHA-256: 9351003b15f13986a6d101c5176f6ae553826847c77e4198996fc36d70287b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8427

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://garglob.ru/uplcv?utm_term=how+to+apply+textures+in+blender+2.7x+%28beginners%29 PDF link annotation
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105bfbc9356e---miwokugotazarodojafamexis.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/37230724623.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/53208319394.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/97570982325.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/minitamevoravo.pdfIn PDF document text
    • http://maxbrio.kr/files/files/jurolovebexifovobegi.pdfIn PDF document text
    • https://anfauglir.com/images/file/banikegorol.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40e9ed3b1b753c66918dfee7a6c66900/97681572636.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/95328941172.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/21725719976.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/62105656034.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/24tdtpll2l8uuep59dt500rp2b/31957183778.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092379c36461---wagajuripominaposi.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/40ae1e426a80b690b6f79d6b41b564b6/37604280140.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/darelawuwonula.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1369c2aeb7---menovonodupofovakenage.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608af14017bdb---koxejiz.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/r3vmapr5eioiefgup2vt9mqobi/pixokuta.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c3aa6c84438643c063206e0182ca31c/bafojugaguwolenapijuxu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be98111f9---44409866761.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeac78ced---babasukubudekezibafo.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/gabelaxiluposunetewixolab.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/gazepona.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dumowil.pdfIn PDF document text
    • http://exima.kr/userData/board/file/89896554575.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/zupeka.pdfIn 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_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 18136 bytes
SHA-256: 0c4462e6526c0fabc0eae104ea9e6b99a68828c72e4ee477586819010337c53d
font_01_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15959 11492 bytes
SHA-256: 4f1be0143f6ae8d45aab5885b1a50e0669216ffe329352adebad2cf1983c0bd6

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