Malicious PDF — malware analysis report

Static analysis result for SHA-256 126490555f6fb260…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 07:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72ef1496019d3e1c4f09fc084175cbed SHA-1: 4feae22eefcbca169efe03d7873bb05aeaaff556 SHA-256: 126490555f6fb2608a963563702286069eee345e63e0fff95aef6b535da36fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of external URIs and link farms strongly indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://ketchas.ru/uplcv?utm_term=how+to+put+google+play+store+back+on+phone PDF link annotation
    • http://tetobox-budapest.hu/uploads/files/nixudavijeramabe.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/13127831370.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/bofober.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/kojafaxelilifiluvevorifuk.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/arpi4tdurbvnhe5o0b8vvmies5/nezafir.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3de622251d8fbf360bca3c40efbfd8df/27752546751.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/51692963052.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090421031673499.pdfIn PDF document text
    • http://mfcpavpos.ru/file/90386164558.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/judodidutefebirivasul.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lokiwisurozapigade.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vibakoka.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/58303541703.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/91381617959.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44024487055.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/zelomudejimixezodedir.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/13244177411.pdfIn PDF document text
    • https://estoniapools.com/contents/files/72732536310.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f1d04d50---65886458399.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/53b38ce4eff8766154e36509feca4df9/64539335407.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zukininibodexomadegaguxip.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/kosasonanatemodinubepito.pdfIn PDF document text
    • 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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 15344 bytes
SHA-256: baf31408e719acadce05a784d8ec1a639ee5d665f5d18ab1bdfa1f8963584ef6
font_01_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 11084 bytes
SHA-256: c53c5fbe89de54fa8b9ca4e919f95a05aebd607247d498467fb5a649173ebeac
font_02_sfnt_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1