Malicious PDF — malware analysis report

Static analysis result for SHA-256 4942768be86cd5fe…

MALICIOUS

PDF

91.4 KB Created: 2021-07-04 01:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23887ddb8e47d9e942b4f34a0fe77e01 SHA-1: a1235b4373253ff2d6acb782fd8415e3eeb32bdf SHA-256: 4942768be86cd5fe1a16b40e1a99f2fae0ebbd5819e29bff3e0367ae725f9918
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. The embedded URLs suggest a lure to external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2fe255cc56191fce5b85b0e184e4a0af/29033968731.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a46d3059---94039114014.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/nutuf.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/cegho5j6ce2o456h33hle92r3l/sugagirujawegibu.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8a2978934fc1f2e66c8928444330af49/jidugurexikisivotuvepul.pdf
    • http://www.irrv.org/uploads/files/98951551414.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/05f2e4de8eb24423e486f7cf168a6850/11743813301.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e91551e6d9---memiki.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160805b1a2a5db---89062953691.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/33125915aedd95d5477f28433c298b22/87809052937.pdf
    • http://uralinteh.com/uploads/files/37089817813.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pafanag.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/354354e8e3c87d7e08e79b09846c84f6/24624761684.pdf
    • https://repare-ton-smartphone.com/userfiles/file/74313233016.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378842792a---63618020716.pdf
    • http://j1medical.com/uploaded/file/bilojefibetizemafuwo.pdf
    • https://alakharia.com/public_html/userfiles/file/guluxufedufo.pdf
    • https://moto-trend.cz/public/files/fck/file/48898189289.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720d772c9d8---95379783809.pdf
    • http://www.aqsclimited.com/EditorImages/file/zopokajifikigadevelep.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/49509824265.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/nezuxefuzofiruvobum.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9b148c5ad75899641529a16d407ae281/ravasupimufe.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbefe1333---56709814618.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=beyond+good+and+evil+nietzsche+quotes
    • 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_off0000ff2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 16792 bytes
font_01_sfnt_off0001173d.bin
2a756a3998b840358f31e75b58a99a607cdbf5d0baab09195cf39754111256c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 18920 bytes
font_02_sfnt_off00014676.bin
b951609dbb50e4afefd61e129b64570a147726292f406784a9d45c3e5c3d0cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14676 11088 bytes