Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22868af9f34e7d9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d131379b48e31554975dfb7bec43541a SHA-1: 7facc8587ba9bbf5affbce4093fcd205d1d49d6d SHA-256: e22868af9f34e7d94821f9d0b5edd29fd0a9af8b64a527a5ee62aecdc9f4f5b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple links and the use of 'utm_term' in some URLs suggest an attempt to lure users to external sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ou-ravda.com/ckfinder/userfiles/files/vanejopefikejiwaxumapak.pdf In PDF document text
    • http://sinojjacob.com/userfiles/file/64437444330.pdfIn PDF document text
    • https://keongracun.org/contents/files/94449950430.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/83558523847.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/11335641750.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e0c8c65211de78b270a90c4fcdf19ec9/defenizonavogalagutewaj.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/rodasubobonevino.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/87080225288.pdfIn PDF document text
    • http://abc-tel.ru/data/File/pusujovelediwu.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/papakojaju.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/bizojepumujukefur.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/sinugewaponefavajiporo.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/74143498530.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeraberabipavulaxe.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/5459722501.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zabimave.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410bfa30b1d---vijoselinetozesasiw.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kexavuwofakaxegubiniju.pdfIn PDF document text
    • http://zenithmetals.com/files/xesodutakisubij.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/gekadevubonimimum.pdfIn PDF document text
    • http://yejida.com/userfiles/file/moxatorizijofuxanekujuvo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/nijefesefidukinalufilu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6fd6663e97a5076cea9597b3f6747206/9551792886.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/58323702889.pdfIn PDF document text
    • http://ebus.cn/up_file/file/42059698161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=shows+to+streamPDF 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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 17844 bytes
SHA-256: 17259e0c8478f1dbcdc1f4f2fb707edc91ba62e4f7011be017f588168b0ad5ad
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10292 bytes
SHA-256: 7f83b201c7d5eb54bbf946f4ce9957964259ae1c6a8399f75d9e7eec364d72f9
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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