Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c60d70c833f312…

MALICIOUS

PDF

107.3 KB Created: 2021-07-04 09:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a36744af8dcf5eca8922e8adf7994a3d SHA-1: 3db5f20cbe48ae048ccff3d4f5c4c74d4a8802ec SHA-256: 71c60d70c833f312a2e06608bfc96d075242fb4459341110618890763e2904e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL destinations are indicative of a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://anhuifan.com/upload_fck/file/2021-7-3/20210703194252795964.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7cdb0ab65efee91ea965ba90dcb74d95/34424613191.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efea82fec7---dabasenejigikujegeku.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607454ada21fb---58518213554.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a8d0336aee068b81edc17fbd1ff876de/getitigisilug.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c756c606a90f082128b45ce74fcab042/lirukilanu.pdf
    • http://lineshare.net/upload/files/20210629182558.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fc7d98abe4d3a392a390ffe7f2ca58b2/memalonudawolexu.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bbf96b8a7f239f83b56acab4498320ed/30270711319.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/83780734667.pdf
    • https://securityguardsupply.org/php/uploads/file/92391459020.pdf
    • https://erdenet.mn/userfiles/file/dedowefirud.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81471adae956ba864565b4f25b2df668/99034459711.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160708473a5d64---vorulitexovulesefisowo.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d72519a41---vibopelebeturekuki.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vdl8t8efijavct9n8aim8mngko/22535399521.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160850b03e7293---wasirevikizul.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/gr9m46h71rdutin3fbtld2o9s9/sozegatedadisilori.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3258421---71456847567.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/171283855da09d66121c6a1353e0d287/metajugelodofiga.pdf
    • http://dges.in/userfiles/file/xegazomo.pdf
    • http://marcelponjee.nl/ponjeefiles/file/pusimagerapijajozumijara.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6d0a2903---84121644100.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vbchk6bamrtn3k9ciak8f5ghdm/50435016773.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pursuit+of+happiness+questions+and+answers
    • 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_off00014016.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 16792 bytes
font_01_sfnt_off00015828.bin
c02469caea844759ebe079388090a8b8ffadd5ddd14e5112a0c2a00703f2767f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15828 17860 bytes
font_02_sfnt_off0001869a.bin
57de064746af9edaef11c9a7c49d9514900605a5e8842b76c40a09ce30cbb43b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1869A 10884 bytes

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