Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8de4f0432863dd3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 04:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0dd4364650f8b1e998ef213e0cd27a8f SHA-1: 9a43cef50b9c215f6403b0f1f1e382fedb99e168 SHA-256: b8de4f0432863dd3a8a7538cb0a40e3793f010fb2d6bdf692a4b833ab3a8b03c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c53e7ae4---nurukometowajux.pdf In PDF document text
    • https://dukumanis.com/contents/files/22070267127.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/palefutox.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/48262058359.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/58864260615.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/37747421565.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16150c53e966cf---12224411642.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/zegarenuvepaxivupoziwu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f4a213745---37631027416.pdfIn PDF document text
    • http://bakoca.hu/files/file/rijozepoxof.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/vejobaxujowusupekura.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478b3b1b418---lafuzat.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/noberakawuwagozewexa.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/76879955212.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/xitarawoxeni.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/fa5736c30613be730ea631288a29bdfd/55467084686.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/muviwofiza.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/juxatuwazoze.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/nekojosimolixa.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nasotoju.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bapomusajoxudegovavu.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/49532894823.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/fiwikuxezaxunojunewimefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+song+download+apkPDF 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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 10780 bytes
SHA-256: b2b3b2b4c99019f284d7d03c70ce3bb6cdcb4755ba1a97d37857ffeb9d44eca5
font_01_sfnt_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 14636 bytes
SHA-256: bbaa3f75e87619b33e1546ba31ff7c7890cad02607328c99acdc7fc94047a2ad

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