Malicious PDF — malware analysis report

Static analysis result for SHA-256 5711841ee8119932…

MALICIOUS

PDF

95.4 KB Created: 2021-07-02 15:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3ae8c2f9c3e15684cedcb78fe82357a SHA-1: d62c914095bf64a02f0d6d6ad3157b128f5a836f SHA-256: 5711841ee8119932927ddcf7417106e0049abfb2e19e250e20a9f97783560d76
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 a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a7fca395---98564193193.pdf
    • http://toonesk.com/upload/15190312560.pdf
    • http://batiment-tunisie.com/userfiles/file/47144495539.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/379a676c17eeb3d7eb5c8b8ad8b59556/38018635287.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bf513e6d54865e968d106d204d27531e/gibizirodazosilip.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32850d0bcb---26352750665.pdf
    • http://shs1977reunion.com/clients/41590/File/nakekenawonaw.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/71d38758ca04cdba1473846517e47ca6/25956653895.pdf
    • http://sns.hu/_user/file/90674782197.pdf
    • https://fallsplat.se/file/bovorum.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66a2f82e---55027436462.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/280946353146.pdf
    • http://constantemails.com/userfiles/file/162305837952164596367.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656179418---duverezufomanekinobo.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbc4efa07---sijiwe.pdf
    • https://hocngoaingu123.com/upload/files/76960190525.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a837151a---55102899267.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717567d780d---somefekuvatexodevebewo.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072785ed4b87---50250322013.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f019ad436d---fazatipejufasixazurom.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7d28f6d0143efb2977d6eb823591cb13/65319563949.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdbf2ce93---41357038757.pdf
    • http://cgl.lu/userfiles/files/65082279684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sighted+contour+drawing
    • 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_off00011375.bin
b42f9a0de86c29dea88981cb2a37a3ecf02c12396b6caa367b718cd88e58990a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 17296 bytes
font_01_sfnt_off00014029.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14029 16792 bytes
font_02_sfnt_off00015840.bin
92fec136d813d9abaa3658f63d400d2f2499beda2e98f26416c910314865a79d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15840 10696 bytes