Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca11d950a24e209…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 21:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a609919470efae7acab4a1b67c82c60f SHA-1: 7263d567fe3603241f2b62d544a86cd9bb1bb9d7 SHA-256: 2ca11d950a24e20966437c4c5f01af6331530c0c20accf725dc7255ef98fb248
136 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote-support tool. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or social engineering attack aimed at gaining unauthorized access through a remote-support pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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://american-security-inc.com/assets/ckfinder/userfiles/files/83958475130.pdf In PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/62211287199.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/37213827937.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/rajadibirededijisudutot.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/413ed2f466e0fcce1b98f50772367681/faroxidaberus.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/95041272127.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/zipalibefej.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/nibabotuxa.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/muwowewigenafavid.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/bekagadimojogujudegi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/1d4e8e0a67adef8ee7278fc0b260697c/19605883930.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/19595348065.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/57037881415.pdfIn PDF document text
    • https://vitanov.rs/files/xewupininor.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/susunomixiji.pdfIn PDF document text
    • https://dineflon.com//files/3040267988.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/63765000402.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/49439404932.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210808100922.pdfIn PDF document text
    • http://badgerhillfarm.uk/moxupenilutapemaputado.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27a52c2c4---jeresit.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/35412d8f6e5f6871e0c8b11e9da38c7e/96186657263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mapa+carril+bici+barcelona+pdfPDF 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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 15928 bytes
SHA-256: 49ace6531403104bf32ab3c808c7d7ef061155ef4772a69fc878f56f79e88261
font_01_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10480 bytes
SHA-256: 096d725ecc936068479dac92efeb39c8708a398cec394d7ac43342eb68d733cc

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