Malicious PDF — malware analysis report

Static analysis result for SHA-256 985b08744e1bfd66…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 20:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17b93d69e5e1e53d0c9b94456bc3cf77 SHA-1: e4570f8902d4fa5fdfb65b9ca0b08a7645c14217 SHA-256: 985b08744e1bfd66132506a6265f9eb3e3464878a9d62575e8c24e1b2d2202c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720bf887d9e---sisafeduz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hgt8hhnbt8g649f2qbl9s8i8f6/46110666400.pdf
    • http://ttccid.com/userfiles/files/26229013603.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d2e739f32773b455aa7fa6902af8c0ab/dorufenugorokunote.pdf
    • http://csptech.net/admin/userfiles/file/nifanugogofetuxezeruzaso.pdf
    • http://maxidmum.com/images/upload/fck/file/pipatasazaruvi.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078809bd3d46---nupuzusumawitifaxuzokib.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a1c110e4---13233737170.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60aeb33446---jezajinava.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7345ae5caf---kiruzezeronut.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81257ebe10---rigawaxurozutuwexoxo.pdf
    • http://creptiles.dk/userfiles/file/gexeb.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/754899bf0eef41c74654da11f55fa95c/98226601121.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f93c6ff4f5ea4b750156e66378acdcf9/xenegobotilojakupob.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160920743a0965---febim.pdf
    • http://archi1919.com/smlclub-files/file/rodijalew.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gm9q3kqo464jl5mchoh3t2evc2/rebixofudoluluninakopez.pdf
    • http://gidaero.com/upload/fckeditor/file/19363037071.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dtas2s05p288rh6niraagg77nt/21486436487.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bctd0kl0pg84rck0gquu8bh39l/62678381273.pdf
    • http://adance0112.com/upfile/editor/file/tokudu.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lidupeviwakodefew.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/711574d4d0ba6cfaea97da4a81363538/45021317713.pdf
    • http://chroscina.com/userfiles/file/46730213912.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=kantha+fort+home+stay
    • 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_off0000e924.bin
a72d02ffc7fdb3ffe3a04b0148a43a407fe2052f3f05c2e458a1991b5f0e4947
pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 17380 bytes
font_01_sfnt_off0001157c.bin
0223d4851195a4ac7da0b14d4d10148caef398a8164f7fb6789d9371b8dfdfc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 10448 bytes
font_02_sfnt_off00012d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 16792 bytes