Malicious PDF — malware analysis report

Static analysis result for SHA-256 9757643c6bc8868a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 04:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 883433f941ebe92cd529efc1c19e94c5 SHA-1: 0c9c5f24ded7d731a906cf0ff0cfd26e0389da47 SHA-256: 9757643c6bc8868acc389d2bb0626afb40f9aef658338bb2bf3372629d4e5265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to download further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cukierniabrzezinski.pl/www/artizam/fck/file/64561507972.pdf In PDF document text
    • http://www.tomasjelinek.com/img/pub/file/9425282412.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u6uc7mkruc5m87u437706cs05t/kilixetumotijinaxu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cbf7360441fc0b08940495385c7461a7/21962317943.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2f587457291d85ab05e9c5468f6ce0ed/6227345458.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///51015348990.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/poxoruf.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/68725998477.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3badbdc02---9672161877.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/nekenofuw.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/fagodasolomofipujoti.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/posegupamodigemamejor.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/wunoxudadatokoxujejebezu.pdfIn PDF document text
    • http://chengzechem.com/upload/files/95300323140.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c789fd07167---1882160183.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/0656c91a1a199b0108d0bd1d66cfb287/94216997567.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad698fd6c---zemebifumipazuwegukusobal.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/legefodofebaparoj.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa95f87226---rifotarekadelowex.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4jneec8caek3ai4ur1r7hqohq6/54426985070.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/90275171867.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/50024794482.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3cf81f5fbd6397eff77e1227aa864c37/xezalotapamalofiguteve.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/54da0dad0c6e57c4089d77225861f72b/saxomixusizefowisiruxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ms+word+book+in+urdu+pdf+free+downloadPDF 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_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 10804 bytes
SHA-256: e17cee2e6e29bb8d2ddac9d3b094c43ac143e31a2b347446e4973242b61ad758
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 18492 bytes
SHA-256: bbf5f567594fe7e4fa02299547e8ab462e142f3a99f9eef92d092eac4278847e