Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e33e42cf1bcc45…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 23:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a88eaca91024cf5b085056d9ef8a65ce SHA-1: 25b9cfd4c4759ff7ccc164718a5a3a756a8875a3 SHA-256: 93e33e42cf1bcc458c0b966f6f4b0ed0eb62647066ff01d4416017bded1bef00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=when+is+redmi+note+9+pro+5g+launching+in+india PDF link annotation
    • http://longvu.vn/Images_upload/files/norikurivuvetanejaju.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/tubuwafote.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aoqfheqoe0piqph75806tpdvg7/pepapugujibixuvidemaduz.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/kumedexud.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9018aabeef749ac9c77625c3403914f3/godipe.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nekol.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/39565518270.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/21125247339.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nimek.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a331f6233bcc0f6a293eda0a7b881a02/60679228929.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d5d992bec36e0a55ebec414b4e6c5dd0/bowujavimodofikelowek.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/xarukumovas.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/jowiparesupabafox.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/wefoxiseto.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sufed.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/16918193573.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/sejematotuvuzusowa.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/27324152729.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/79237902055.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/20738259477.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kuginusoden.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefumesejoxozagipokag.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/90603776722.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rokawupelepe.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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 11356 bytes
SHA-256: a58a52f1193bfed60523131678efc17837edf7202d308679304aa16ed06beea3
font_01_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 16632 bytes
SHA-256: 0a91925af06a4d8f61429d54a40a61ad4cb07262bb7af1a14a1953a3a1cc606a
font_02_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1