Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9051de4d6b3ab4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 00:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b40e3480af0c7dc89f2e5413705054f SHA-1: 9670902da983c3d15c7787fb47e78159ee711fd7 SHA-256: db9051de4d6b3ab465a1a8e9fe4e3a1024119db4b1ad51c8be899232903c20cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=how+to+reset+pattern+lock+without+losing+data PDF link annotation
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133db106058e---43579418700.pdfIn PDF document text
    • https://ienter.bg/files/64294191048.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/81203932456.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/luroro.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe381cd67f---45298429891.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/kogugavukosebubuvu.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/xavapa.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/38211698011.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3258139e62fb9742ef639ff166044461/47959199936.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/63204837508.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/38181517127.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/55344850773.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/ruxasewureweneketan.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/97091898667.pdfIn PDF document text
    • http://metallpress.info/files/6995917159.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/60918926041.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/bevewotazunasus.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tajifafe.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/51893349319.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/48650514282.pdfIn PDF document text
    • http://fitviewer.info/files/file/60821727004.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bidabosejaled.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/12847587363.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/rikapoxulakonejefivu.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/49929394734.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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 11064 bytes
SHA-256: 35f87cd87fdd32b53ae73aed23a1635c31e519b1bed3f510cae074ee2ca6ca87
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17604 bytes
SHA-256: 99b95fbaf740f49c7de00413836abe13d8a3fd80524b9b8cd5f5cf3bdcc9866e
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1