Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ba4a541a3c0b1c…

MALICIOUS

PDF

83.2 KB Created: 2021-10-06 09:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cabc5af0d659f47ea0beb219de0ed35d SHA-1: 749af37921d30a747868547c6c4b925fa714e856 SHA-256: c5ba4a541a3c0b1ca27473fb6de9d0e7c185a2ff31069b4670b2568055e2a4fa
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cctsw.net/whly/up_files/FCK/file/20210921_170543_103.pdf In PDF document text
    • http://flexinform.com/hirlevel/file/68918620936.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/96570403796.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/45929163843.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/4670202650.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/fowupumokagofuxef.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/765updegu818tj4so70e5e30e3/joboxizarepididupugaref.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xavigiz.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/37940449318.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/52914541653.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/44001456503.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/27d1e682cb95cd37bc50d7e95331eb41/14674022550.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/badozudi.pdfIn PDF document text
    • http://airmon.hu/images/files/66995624632.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/fomubefo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/29210200156.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/17126061543.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134296f2ca58---xabomudusolupedal.pdfIn PDF document text
    • https://slide-bearing.com/d/files/vizizu.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/44302276414.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/miwomavit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=elementary+classical+analysis+marsden+solutionsPDF 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 20552 bytes
SHA-256: 872aa7ca265a54a77da17c7698e0256cee05f47f27f46e18741e5a65eb912974
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 10728 bytes
SHA-256: 44eaef97c62bdb7a943deed84ed06a44c70b9e6a1eb519e5fbfda4287b6a0830

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