Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05e45bf133ec4c0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 06:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e1175365e83a90008ae4aa618a60ad6d SHA-1: 2d6c97b9a68b670578ba8ef2381bb732a8d2e9fd SHA-256: f05e45bf133ec4c02932857ea2a9d1a1cf1df525e7d9f241d74a9f68b33ffce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to distribute malware or conduct phishing attacks, likely delivered as a spearphishing attachment.

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 https://nomylo.ru/uplcv?utm_term=a+court+of+wings+and+ruin+pdf PDF link annotation
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/945354b530d6ebdb7c53b89b34d13fb7/zusosopezozolutukafaxef.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/64973853727.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/15003483581.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/laxowonuxigeram.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/10129782457.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81446e9dbfefdc5cfda71f387a49443c/tanebisekosajowibol.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160841d42a07c9---lobedem.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/vanudoxaxuseledape.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/jinexegileles.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d13ab45f336327a50d90c2b54d2f4298/96769420459.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/82078292070.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611310720b943---morabepumaxu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a929aa19400---rodajezebimavelatawo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/vavazuwaxonoruwegutulema.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/30627436553.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bizogefepupi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff9e36494---wewekizoxa.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/94412295825.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ap0vfnlilldh1jhk4s9809rifm/80069002721.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c48101807e4d502d663e1c3c376c0f9c/mafufukukoxibaxa.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mebawutipizakiwulejot.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dhlouq8j5dblemp7lqduf3k690/kigukinivakudetadudede.pdfIn PDF document text
    • https://seikico.net/img-tym/files/sirebalupowowe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/wapak.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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 10784 bytes
SHA-256: 0265ac3a73f84d78643d21a3336bbd9e78bd57f75931abf243909ffd7efa9b0c
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 16764 bytes
SHA-256: 2a4e4f1fbd9fb68cca2f0aca5a9144f98bbb1e544bcde89f608470759c540b62