Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c6d3885429eb96…

MALICIOUS

PDF

82.7 KB Created: 2021-08-27 05:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c46ab916c08b03ea91dbb5e68004c91 SHA-1: 0dfc703b8927ce1535fb5c20db6168f29dfd896e SHA-256: 02c6d3885429eb96800060a2f274bbb428355f1c332f67eb88b1e336c54deb5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a machine learning classifier and ClamAV. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=world+of+darkness+armory+reloaded+pdf', suggest a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=world+of+darkness+armory+reloaded+pdf PDF link annotation
    • https://ldoris.com/upfile/files/20210726230642.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/sarumunipa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/84f5c7a4f88ae68d886b39aa31dae822/jesaxovewilatutumibuzib.pdfIn PDF document text
    • http://momsystem.ru/public/file/73134795641.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/lazagubuzasifilowanejubul.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/90795894416.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/filakokitedarimetob.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/zuloterepewagamojiti.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/regotewinaniredexu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89588321ab---39285612081.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0c51gg1jrevmb62ooml9c0inij/rerarolebewiruzuzimatoni.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254a91b3df2---97758368872.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/74877980010.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xejifarolosobewana.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/wajigabugafepirovokoz.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/95288006313.pdfIn PDF document text
    • https://trexanh.net/upload/files/97707673100.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/muviseridezivifenela.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/dufutoxepafazijerora.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611800c2acfb6---zajisofujelazom.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2d2a3bedfca8f02b495115005fcd8994/69272049461.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ef0489b83b9c9d3191ee82037b19e6a0/vepixupexejakikawiganak.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609652a46770e---81621043226.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/isb35ecipkj0sh3fdj0nt39d0g/pavatasolodizegamozo.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_off0000de0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 17356 bytes
SHA-256: fd7a44bf960590d2cd7d9d85d70331f4d83d209dcc7e328a1bddf83ce1d8996d
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 10668 bytes
SHA-256: 400762b1afd171c8f9dece69572f59e560d2bc80bd4c7c5fece3eda42c62c0a0