Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8538b8f3297a9f…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 05:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5946d6b966778f9edecce175d37e7bdd SHA-1: 042bb737113943eb800cce28ad6a66100e2ffd1f SHA-256: 7e8538b8f3297a9f819ca4d0a749d94b0605f93309a9ec5af2ae500fd38241b2
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary goal is to redirect users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdce542af2---rozoziwufimetesaki.pdf In PDF document text
    • http://travelbilet.ru/sites/default/files/file/69895942564.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ac8d60e713877e5f82eeca662dfec429/jisidofijozuzogixuzakotoj.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xebid.pdfIn PDF document text
    • http://promador.pl/userfiles/file/fovesumuwiladagox.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/vuriwijare.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/wezirofifo.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/suxolunodedugileb.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b2ab741a---pumutisexuxo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872fe96ee8e---xunejivamojatovoroziv.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/53383773977.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/bifame.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tujodaf.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/64390912345.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/873422a06fc6a6267e6219d9edd789bd/60548240641.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/84664612074.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d9976b---tanabe.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6r8ubmv0d25upec40646nis2eb/xikerokukogutejoxekuf.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/wusokolojodedagepomuv.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/aasq217v003679r0d2qh1j1n6l/50727097753.pdfIn PDF document text
    • https://plasy.com/uploads/file/wawajuxexowusirejibam.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/zulaju.pdfIn PDF document text
    • https://x-software.cz/data/file/demife.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42111040801.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/71848096282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+connect+wireless+soundbar+to+vizio+tvPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10804 bytes
SHA-256: eaf276aced4e45bfb566b293a05de3ffadeac926c480e1df1d47b51428be07fd
font_02_sfnt_off00011e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 16776 bytes
SHA-256: a8ed52b13525099b595f86388cc838602cd9ef2c17b215637ebd81d8b4ec7d6b

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