Malicious PDF — malware analysis report

Static analysis result for SHA-256 8405e72f1e3ba84c…

MALICIOUS

PDF

96.5 KB Created: 2021-07-16 20:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8a495f21ac62292b2b29f644f751f8e SHA-1: 4a4296318d1a8f977d06c3443039df5a1ded939c SHA-256: 8405e72f1e3ba84c778276af6af5c413df19b03913fb39e671638bba5048c839
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to distribute further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fa6ce2cf7f0d13e0efb2699d4932cc0/zotinaxoreronavixujod.pdf
    • http://coreaad.com/DreamDataUpload/file/46237336150.pdf
    • http://samtekelektrik.com/files/fotufifoxonufen.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1fc7222e---44381360149.pdf
    • http://atol-res.pl/uploads/file/bugujijarafidekaz.pdf
    • http://nicosiacaffe.it/file/vuvabakeladafakewijaz.pdf
    • https://loctra.net/userfiles/file/92460956887.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081fc7c69f---84363838932.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/vonanidixedegasidu.pdf
    • http://hrt-foto.hu/_user/file/12870022417.pdf
    • http://dent-pro.cz/pic/file/12172357886.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mga8hjfe7n6s7f6s9igjob5gbt/22867144058.pdf
    • http://normel.org/files/upload/file/17641597623.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9cee46c58642d0490e6a970dc9bf433e/38951005449.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a548d312d57---8889760304.pdf
    • http://slhs1958.com/clients/18590/File/jenete.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/73485720376.pdf
    • http://macautemple.com/userfiles/file/24361947516.pdf
    • http://someteme.com/archivos/_20210620103834.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160784be04de16---84506538062.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9f093656---55773674369.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abe641213ca---55274109080.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bead599da---35101323655.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stratford+sixth+form+college
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdc.bin
adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16336 bytes
font_01_sfnt_off000111df.bin
b977eb9ff0fd3e54a1ca84c4de5884bb258cf761c5bc48d996d1984eb1fb01ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10996 bytes
font_02_sfnt_off00012b38.bin
7bc7c1856287f4ac70644cbcfae1ebaceb42632a98461c6887b2425a5c452b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 18364 bytes
font_03_sfnt_off00015c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C1D 16792 bytes

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