Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dba2d5133b2024…

MALICIOUS

PDF

79.5 KB Created: 2021-08-02 15:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74c0235b9b8c810d66fa7c77e8cb9769 SHA-1: 73b1f73308590259c9bb3f89d3260cbd46997358 SHA-256: 30dba2d5133b20245fe68686bd95e4b5efe43ac752111bd858e5721cde769bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a campaign to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=nonton+film+catarina+and+the+others+%282011%29 PDF link annotation
    • http://www.alfapilates.pl/upload/file/biradikutizafoveloloxafi.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/futofonuvuvarum.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91af9c564---sifed.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/4a4c9f6aa328ff131ea3680681b04777/29956070875.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622884040.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/wedakisigoz.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/mutapifumapejekiwokezi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9smk7566uq42rs4r48pa2hfn2e/kevuna.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/lolejazubisutowedipada.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/lubejakatukuref.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/rezakuzigasedajexidinuneb.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210520231349149.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kuraxuj.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/15253329857.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/48502521221.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/56786205117.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/bijukemuralorefobupidag.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/66433755888.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/63184841183.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/98u7ua2bf75k0hls8k7t5mdf91/47649055781.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/33495487024.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074848b05f3d---xupegaralusatu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/40855234121.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_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 11168 bytes
SHA-256: 6ad2aa62464799e55a16ce7fb841363d08d5bb2791d703dc4850c10728d925b0
font_01_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 18672 bytes
SHA-256: fff4a821ff83769d1c3d39851058493ae428c72b2d956e4603cb2e894522e4af

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