Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee16bcddc775e05…

MALICIOUS

PDF

81.9 KB Created: 2021-06-25 12:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cefcb27d7788b661454b3cf3d23a5fb SHA-1: 2267c78a530c52fa92d72a256e280d02ac3bd3e5 SHA-256: 6ee16bcddc775e05a0bb67f2a8ce91a436e26a36a1a1094ee22e37bb89c6d5bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=state+board+10th+class+maths+notes+pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cfb66f335---laler.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f768f9848bb34115efe80b937057114c/1105705481.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cb93f468---23680954647.pdf
    • http://ekolojikweb.net/upld/userfiles/file/xosegizuxagojuwafuzizeno.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5677b1e8c77ab5068150c401cfad5b69/diwinolenabovulugudo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fff0d1fc8---valemopadepolet.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dcf9e3eb82f991336e2b269494d8e68c/jarotovege.pdf
    • http://doo-san.com/userfiles/file/20210513234441.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb13aa82df3---tozasabij.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983689b0178---44268335739.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/836273255e26f02734c2e2f64ea14a6a/maxupaginebera.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gq481e5fce6olabh2ufrv42kp6/85603607843.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/43d075ab9b5c216ea4182beb6989f241/fexalaf.pdf
    • http://bandenplaats.nl/cmsimages/file/waxofozidavin.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/37415312a0cd9ab2714811e6d13e6044/mijejotiwiwiz.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608010667e6ab---33756842440.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_off0000dd07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 16792 bytes
font_01_sfnt_off0000f519.bin
9a7ca15ad4052c54c9d8fc3601a6b4ebdd2dcbdffc317b9d6efa9c186c7b0bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16908 bytes
font_02_sfnt_off0001213f.bin
01949eac9bc277a5c44b411ac1498ad6479b55765256dda994bc4670e62c4f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 11184 bytes

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