Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fb1f1ffe69109e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 14:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a3fb9e7abe2aaa3649267f714b0b61d SHA-1: 30e168e02ae59058d14b6a3e491861b910a53f2f SHA-256: b9fb1f1ffe69109e979d6f3b8cd5b9800742b797b46f08ea0c38325470468d02
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which appear to be compromised CMS uploads. These links likely serve to redirect users to malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57e86de78925c8c921640354b1f0dd30/46534646555.pdf In PDF document text
    • http://crocepadrekolbe.it/userfiles/files/26218078392.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/gerekelowarijimalopifom.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bcc051334---vugebadizavenuru.pdfIn PDF document text
    • http://foundlight.ca/home/foun6192/public_html/files/custom_files/file/74185977529.pdfIn PDF document text
    • http://industrialdevices.in/uploads/powunas.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/63832740850.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16144856193007---momibiruxuxituzotisal.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0iciq9u9sk9ankonh2n1ipgok5/92532693270.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/b633be4ed3b5cbad9d7913c7b0200a23/gajojopajinenowuzijuvitel.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/fawuxozemojamusorewa.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/88167454803.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fejimewapojerunixa.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fedunufetebamowefudu.pdfIn PDF document text
    • http://4of100churchstreet.com/assets/media/files/rutote.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/xigogabar.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614546f892edb---xenakidadusibixaberira.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/11304383252.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3784c8aba2e50fc165ce96d90fdf77c9/83678356991.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/5939060077.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/33922984455.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/5125080873.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fasaxugux.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/63387654297.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/61882428518.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/25988244958.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tojugavuxirirajamop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mod+of+pokemon+goPDF 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_off0000bd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 21560 bytes
SHA-256: f05a9751566daea616e972ddf2200da1471c65a16646b06798bfd9c7c2dca182
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10260 bytes
SHA-256: 688de9e7819c9c0afa6344b3cd8a31954e6aa183f0d92785d3a78dbad4289a87
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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