Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8573bcf8e4ec51a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 16:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 304bf99e933991a10ed420cac0f36df5 SHA-1: c68f3819331463a5ca20d92193bfbd2fd50b772d SHA-256: b8573bcf8e4ec51a6e8494fa86d1bd05c317278f0b671d55580b481e48dfc05e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.leasebridge.com/CKUPimg/files/dovubasik.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/10888198400.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088630f70781---58833853133.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/lefosigujawaje.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/64152760792.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/vabapilozejoloxuje.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/sulekat.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/57092766869.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jesedobibuwufuruf.pdfIn PDF document text
    • http://getem.eu/files/file/28882513474.pdfIn PDF document text
    • http://msiutilities.biz/documents/45430512512.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/51888092163.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4cf9190b---makonewonugojurexigod.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d451ddf3b79---49913596521.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/97422535987.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/39641837712.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/latodesumubevugowaribevo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fikegezodevafavilegorene.pdfIn PDF document text
    • http://greenbrier101.com/userimages/42889666619.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/23090649543.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/gexafelokag.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/47736429050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=accounting+procedures+manual+examplePDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 17680 bytes
SHA-256: 203218c5be87e7de346e82160b6b7c7f4b1efa2cb7440981b8c86b3b66317367
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 11040 bytes
SHA-256: b3e64b5a4196fedf3a15388dad74dd668b0eb32b74fe101d729d58ccb24a468a

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