Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e3de44f036b66…

MALICIOUS

PDF

81.1 KB Created: 2021-08-20 10:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd54d4f0c2e6c0148551421274e3f2cc SHA-1: 7218f69c6f583a08aa7ff967843e038007c14da1 SHA-256: 211e3de44f036b66748db2ee725426ae4bb995dec14472f6aab3338de9a0da54
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. The presence of invoice/payment lure language further supports a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f07e8a0461982d0f6326ed070daf26e7/fofidosuvutizitebiwubusev.pdf In PDF document text
    • https://guclupin.com/calisma2/files/uploads/raranajexidiwazoxuxe.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/na1pim588ek38m213fgvmi6jee/46180704001.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/me5l8pffp4t54pf1rcjufn943i/mixoxame.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/97859628236.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/sdsg92sp5p8a00bgf371icf2a7/94227739160.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb2d3dbee---40121399889.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b668a523765---gugudimabuko.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/30024580292.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40945693904.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/japunegirorek.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f408ae90ac2---91914937357.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/gisomidakizepufuwukid.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/76326233650.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/9t7a8q0c0gosa5pq4se83hnuf4/kinegukividoxejapo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29f10d49d7---31643665051.pdfIn PDF document text
    • https://telenovella-bg.com/files/mokelefiwov.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/disejodetu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f073c9902a---muximanigijulafulevexigev.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/60083590392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=does+paypal+card+have+feesPDF 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_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10604 bytes
SHA-256: 15faf651aa53fd27001b3b39b657bbd403bb84fe3028d703c97ee0646a88c8e7
font_02_sfnt_off00010a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A92 16964 bytes
SHA-256: 13ffa8c68ca75c04429eb0df17247a4108114c264e7731fd6805f3a05eb5f132

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