Malicious PDF — malware analysis report

Static analysis result for SHA-256 d243e6ccc627344c…

MALICIOUS

PDF

109.8 KB Created: 2021-07-01 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d544547dff623e5fe9944d333b3261 SHA-1: f7fd6148c0bf9b7c07f4ea2cef4711022384e59f SHA-256: d243e6ccc627344cb95f9b18c76957169f1bcafc6d2e553aa027834fd0a532c5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://k-newsletter.com/ckupload/files/86034235530.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/udjrc3k0p9a4kh99v0gg32lktl/10734703146.pdf
    • http://c2ctrading.org/cms_upload/files/46428386704.pdf
    • https://epiphanych.com/images/file/silepiberatoxos.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0defa25dc2fc4974ff110f7f2bfe7380/1899689022.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d7da0cac---95010987569.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c86a29fd---bejokorogirosewivivirafuf.pdf
    • https://bywuf.org/upload/editor/files/12719190147.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c258214d4f---wawevu.pdf
    • http://capital96.com/userfiles/file/25499584336.pdf
    • http://cristal-in.fr/userfiles/file/vuler.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4ti320v43qfc3r9o2ns9ljd3v6/gemoroxupus.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/037ff440f6f00f29027ae3cf29cec84f/22954582639.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c6d05204---63501413519.pdf
    • https://fokusmedia.com/images/uploads/fusovemetibumigup.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb22c93edc9---4518566401.pdf
    • http://jevades.com/aircraft/fckimages/file/12051327587.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69cb78591---49703178363.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096bc93c74f8---19992949693.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/1ff17af4b4934c0aba5b359b1cd80c42/gexaravutu.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b802c16d007---48609058678.pdf
    • https://afra24.com/basefile/afra24/files/11153138505.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089a13775327---lumozezositetujevaj.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9a5dc57d---41645678280.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/dccab0da85454cf7baa4125fa9f419e5/78245066126.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=decomposers+in+the+pacific+ocean
    • 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_off00014fc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 16792 bytes
font_01_sfnt_off000167e0.bin
50fe8305acbda8337e1ae6ad9a6c5738d51bc6cf654aa11c2c08e681a814589f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167E0 10700 bytes
font_02_sfnt_off00018039.bin
d17d66bedd6ea0ea792db58da5c1b6954b2311074b55e6339700018529506017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18039 16040 bytes

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