Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1cf329f3265051…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 14:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6bdb6c9cafb7a5c797f1fdc07ff4ce4 SHA-1: 9b9a2c5d289e3e9087c48aa9effd54c0e812cb00 SHA-256: eb1cf329f32650513147fc458a9e7c84163ea52629f02c85c0e7bf91780f9008
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm hosted on compromised WordPress sites and attempts to trick the user into installing a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests potential for JavaScript execution or exploitation to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/17173208d8cfbe6d131e14f10292211a/29576934008.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4a6eaa78---kubavupawamowosufifero.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088dac498dcf---11483170572.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b9227205d---dufidobexu.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160829398c1de6---88870318949.pdf
    • http://93564497.com/userfiles/54293203737.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2190aiq7ihgrbm71bd21aabp47/51525849220.pdf
    • http://bright-inter.com/file_media/file_image/file/sabakum.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76cecb007d---vuwaxixakajiv.pdf
    • http://czdashan.cn/uploadfile/file/2021050317210873499.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/41383359588.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb28f240fd---44254244380.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/47118911276.pdf
    • https://stopserv.ru/files/file/87403413153.pdf
    • http://antifftech.com/uploadfile/file///2021050119031334.pdf
    • http://https://www.blm
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=red+rock+canyon+scenic+drive
    • 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_off0000eda0.bin
de2a19d73a75db1598f634f3805a9756cdb944cefe95d03f426de2ec1e38ebe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 17332 bytes
font_01_sfnt_off00011b7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 16792 bytes
font_02_sfnt_off00013392.bin
d6fbe0bbe5960ccfc4f3578b11e628997655c987d985458ef856e254746dee76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 10536 bytes

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