Malicious PDF — malware analysis report

Static analysis result for SHA-256 d632e18f890c9470…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 053f0db07008b83c8fbcff91e058542f SHA-1: f0ff680887d33f1b8d73eeb0704612c09fa0eaf5 SHA-256: d632e18f890c94708704c85b48c73186e536a181029e3d34f90e7cdeae65072d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious files. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=rog+game+turbo+apk PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/19bee8b8496e4deebe1b3c4f7ffb8f53/21302812723.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/12749354234.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210912_055648.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/46543237905.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/692964535.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/38190458518.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd193ba1e1---losekolifa.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jubusowuxagiborebi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c426d8f1d6---77926842047.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/21517781053.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/zobotitijafitutu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/jatisoweguvu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/vixapopularexi.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/xiganekos.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/zesilopemifowijirefado.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/3219281225.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f0afe9bb80c0d82eb7cdd437eec9033b/mugifa.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/40298768248.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/69287915488.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/puwafuwogezovumelukesavo.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/93964877194.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/konovuzapepibobawaje.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/72427901213.pdfIn PDF document text
    • https://bak.vn/upload/files/boliturepunatejimite.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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 16088 bytes
SHA-256: 822b9062fd62e79639da5d9a7aa758b3c9ca38b3e8131c6c71d7918882ae2f77
font_01_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 10564 bytes
SHA-256: 489f0cef421082fd319bcac328d96bd832f17774ae297ea375b8df6081cf390b
font_02_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1