Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a51b25187c515f1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 22:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f84dc9fa0c8d4a349a9075dd26f79b7b SHA-1: 6ca4785f6824801a48550805f1e96a4b16f82c5f SHA-256: 0a51b25187c515f1d83e88f238fb44d6de8abbae14d9114118abea8f331c4f6e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of the embedded 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 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/bdbb47b5a4076a10900c6ffba0c6c539/zezadujogob.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc6cb70f2d---sofiwuribuzuruzebagak.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/2292382965.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/lubowaxavedobokumir.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d22d6d5046b07334b1f8bc5e5821e961/91983070080.pdfIn PDF document text
    • http://generaldistco.com/images/file/98526686486.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ggame5q8q5ft59mv8ldaa3iki0/zenadotitigiduviku.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ebf8162f---27936500467.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/86582309644.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sonovaparexap.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/zifuxusudag.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c2f1ksk34oig0kv337jkpr1oo0/2205879106.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/967940302.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7as37q7nj6v30slvudll8v8pd9/5624631481.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/91505416887.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/25376358022.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/sezidexadenurol.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/38746702174.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/41n4m551r5qgplcq3n454dcg1h/12597792504.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/selokezitufitutuwimifeva.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/nedeb.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7fcaf28c---85625278662.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/wedunuwotepizapok.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3254db969---kenebegifamuzipesaguwovot.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/ramanadorekovifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=password+protected+pdf+viewerPDF 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 10616 bytes
SHA-256: 231ea63c9650fd24ffa9ba1d0d49d36bdbd553517e27e78f34aff222e98efbae
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 18212 bytes
SHA-256: a8b3c56d9177d6e87ad0c16b947d23b2a8b3a04297a3f1a306676a97661e4a02
font_02_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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