Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba68f608060bfcf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d3cf6be506c3ec2ce8f13c178e29086 SHA-1: 4f3d8a326f13273234b18fba52866be1c99f04bc SHA-256: cba68f608060bfcf8464a08db91565238276a03bb0b847b3c03ded55e2356de7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://casaatlantida.com/userfiles/file///lazedebi.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070316caa756---21376110092.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/pivevupajofowepitidebegim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50577f559---99092173279.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddd5843dc2---566419577.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d247ad5267e510966be4c70f47ef2bc6/notigesiz.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93dbb63e6a---dejax.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/36440445224.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/88178243170.pdfIn PDF document text
    • https://biocoils.com/img/file/84098742160.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/60118781745.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/ligijanizapabakina.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d54de105c5d505f18f866a5c67ca621b/29674568924.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/bikufawamemaxif.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/tafelibev.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/sujuduzaribeb.pdfIn PDF document text
    • http://bptramptour.pl/files/file/38809120442.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/perepuga.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d74537bb7---xereb.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108131936524454.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16074b197647b2---bonunarop.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160736c0bcd5a3---deremipodaxanago.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/29252a327f20264fd9956480291e5fb8/radelusak.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zufov.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xotubopakexemipoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=graph+paper+pdf+greenPDF 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_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 10292 bytes
SHA-256: 8a84b924affc5604455f8a6d8bcf1c6e65600acf864c8656c35bec055d9c463f
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 17260 bytes
SHA-256: e1cbc4a2e6aadc4d2e9d9493fdeffd511db45de2da61a8bc4794567e484b31d9