Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0b295115c9072d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 15:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdccfdf799a91f2c1ad42976bb7dc70b SHA-1: 8764b1f23f13bbd82aeefb787824175461737174 SHA-256: fa0b295115c9072dc5b996600e9cb98c0f7746c72cfa32066c75cf747d724fa5
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a remote-support tool lure, instructing the user to install or connect with such a tool. This is a common tactic for gaining unauthorized access to a victim's system. The presence of multiple links to potentially compromised or disposable hosting sites further supports a malicious intent, likely to deliver a secondary payload or phish for credentials. ClamAV detection and ML classification strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://psychologkmalinowska.pl/ckfinder/userfiles/files/53280596017.pdf In PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/65608815504.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/68291416400.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130be919e874---59878090996.pdfIn PDF document text
    • http://grandfiltr.com/files/file/vabuzaserin.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ieu7bu898d1r6sl6jtngltuaj1/verivexap.pdfIn PDF document text
    • https://krossi.ru/images/content/files/joxunekimawafu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/8061806632.pdfIn PDF document text
    • http://emannsltd.com/userfiles/7211191461.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/ravurumuvatafuroxufomeg.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gefudetaxumojifusofenile.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/wegutatokujotuke.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/91404104882.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/populokigen.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f228bf8a341a6e201a0b6bc1c8d7285d/12084074580.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gaxusunadafegik.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/lososanonoru.pdfIn PDF document text
    • https://alutat.com/data/file/57775743062.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/pavidum.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/zowakatamosipepelew.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613286880028d---98527736422.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/duwobuwotagoxojujis.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/menolapimevimuwafuwexabos.pdfIn PDF document text
    • http://bdsductri.com/upload/files/69322622209.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/64132415933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=maxytec+remote+appPDF 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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 18116 bytes
SHA-256: 65e5b726081e987fc326f5d661785d66127226fa7b34380d5041e0d9f3ff3009
font_02_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10332 bytes
SHA-256: 134858e736bf93be5e6c6ede55ed5ca2a97fc0a941fb114358a4f16e5ab5283d

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