Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9243a0f4f99b4b1…

MALICIOUS

PDF

74.9 KB Created: 2021-08-11 01:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7f8c73fcd83eec0a9ce1b886f0d396e9 SHA-1: f31fceda15218508c44f517cf80f8e25919dc186 SHA-256: d9243a0f4f99b4b1be85e7027afbc932ff0a04f06d798d7b1b1eda4d7950b37a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8672

Heuristics 4

  • 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://infrive.ru/uplcv?utm_term=how+to+fix+brom+error+s_ft_download_fail+%284008%29 PDF link annotation
    • http://qdjshg.com/files/file/vuvuzonusemufi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/55071143350.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20217256678686.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfcd542bd---7298530319.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b9322b15---rovamimukovuvifon.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc751d9538---96482304222.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/wukuxatej.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/fetovapuzitepat.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kerorubilazovojoza.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16107ecffe9eac---danisu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/6346807569.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/43649713004.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/dae083d084a5ca0efbac8794eb93491a/76731810418.pdfIn PDF document text
    • https://brakos.it/file/85954054450.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae899c3d2---kepudin.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58bc0defd6f4558f29a17606337c18dd/10777259649.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/48113326546.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/rofaluxajo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d2f3bea19a14deaf2e5bb2c0adc602f4/47054064248.pdfIn PDF document text
    • http://riversedgefm.com/files/file/50108738614.pdfIn PDF document text
    • http://web5gstore.com/Files/files/56328986143.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/4c95417044f86edef908788c23f9e3f1/kapemozedekizeterenola.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16108675e98ce6---25673968972.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 11432 bytes
SHA-256: dc8f20ad2daef5b103ed3040882849494dc7a8499af6bfd2179af75490f7ec31

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