Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ba4e9a75b509d7…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 22:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 354a32731cf6c434dcaef87ddd338787 SHA-1: 403022dc278e9e41399459622abfb39710617e30 SHA-256: f1ba4e9a75b509d736da73946664ec794157a34ada3d636e33f748dbf13ae8be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=tree+time+lapse
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/564fab908c485481a69d49efc945166a/talipijupadarorimafa.pdf
    • http://csc010.com/userfiles/file/20210625234347_8algn4.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3d977bb667bd42bfdeff74f17890b36e/53531323912.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcd50botk8pd7hdt6lhome84c5/jazejosenupuga.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc516c69ad---44673179418.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44b4c5a70---xulabitel.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2dce221d7677eb47285883a9f642b9cb/gabokiwabuzexevetifepekel.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399a799bd5---501478386.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/huq1ue095ja93jb35nbuaiahj1/15238540813.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0f8ef6e34e19da25bb900ca74550d8fc/48739143358.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e573c4a---rasalesajurobulajadu.pdf
    • http://askort.pl/Upload/file/kazetusufetogubus.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8bc41ef7e---rivepujexali.pdf
    • http://xn--d1achljw0b.xn--p1ai/content/upload/45999733733.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160882bb7b8d00---63254107899.pdf
    • http://abnicum.com/files/file/55407483446.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7a6660e108605d3aff36c69ed61ce0d/49221370963.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8c7a0bfc8f0ad5e836e1f79c1b476785/bozovozejalamasadumitoti.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3cfa91963d585039a8aca9b55f659067/kadisegofadosaruz.pdf
    • http://lhs1965.com/clients/880801/File/91466130200.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/gdevf9q4apniodnq8et4nfrbsb/relojekuluwekapatobo.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/601e1971870dc677f6db650adadacbbb/73770099535.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079faa983ba2---4072580789.pdf
    • http://garageanything.com/js/upload/files/28985845281.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609101bf286b5---24822293037.pdf
    • http://caigeshi.com/uploadfile/file/2021060323132973499.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4u2on4904uli2cmtf161226qo6/91742844540.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d962f19b---51521354064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 16792 bytes
font_01_sfnt_off0000fff8.bin
48b0f8e16f21c49eb668d5679464756a1860470d368adc8494454502f3468022		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 17584 bytes
font_02_sfnt_off00012db8.bin
27e1eb1e7c6044a3e8c99775ead5645895cf6082dc83dcc27fe89457669a79b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 10152 bytes

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