Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f87ffe7e38a6280…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 11:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b2258ec887b48835549f0a9da6f243 SHA-1: 13dda28555522d62aca760090066b55c036f0387 SHA-256: 6f87ffe7e38a6280b9b586be0383a54fa042f8d2dd5f769661aed52c080bf171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alnadaoil.com/userfiles/file/volojelesegaki.pdf
    • http://beastyenergy.com/userfiles/file/78906878154.pdf
    • http://www.ap-arte.ro/fckupload/file/11783714895.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd7fd585ecfdfb81e99bbe9ab32f460d/gowovenobebiwubako.pdf
    • http://jongauger.com/userfiles/file/92170020788.pdf
    • http://novena99.com/uploads/files/202109191149047749.pdf
    • http://www.majbrno.cz/uploads/files/revetugu.pdf
    • https://receptabc.hu/images_banner/files/tagegafabemoxawova.pdf
    • http://ttmm.co.jp/ckfinder/userfiles/files/93402549533.pdf
    • http://internet-trade.eu/UserFiles/file/56007383987.pdf
    • http://computer-rudolstadt.de/upload/file/kademuzagatan.pdf
    • https://memo-log.com/userfiles/file/livakemagakes.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/zapaxi.pdf
    • http://filippodelvita.com/demo/userfiles/file/febixiju.pdf
    • http://actlogistic.vn/upload/editor/files/59331364986.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/jigaxozipufosile.pdf
    • http://domki-kopalino.pl/pliki/xokepupuxagidenamixef.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e6d720ad---32185984340.pdf
    • http://www.toptehnik.si/images/11277397073.pdf
    • http://htwy.com/upload/file/18504901871.pdf
    • http://lynxauto.ru/userfiles/file/82902541767.pdf
    • http://vncdata.net/app/webroot/uploads/files/gijume.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16150faa69baa8---gajopagukik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bedlington+whippet+appreciation+group
    • 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_off0000b37c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 16792 bytes
font_01_sfnt_off0000cb8e.bin
7599d5f21af1b3bf71e739e7f82f6e80c9c297c75ade2f74dcd0284c669a9f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 16396 bytes
font_02_sfnt_off0000f540.bin
cd942f2c99eca366996f9c8d0bc7003fe113a9f60f7cb630790bb368e543c8fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10864 bytes

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