Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0df39e21c5655bb…

MALICIOUS

PDF

131.5 KB Created: 2021-09-02 03:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9192f3f93cf2fd28ceaa8df9af6ec7c SHA-1: 964af49836991fc384fa2b18b42d864d0569901d SHA-256: b0df39e21c5655bb228350f9e0a4fc2f1be8d9b68027659b507ee67d93aebad3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to external sites. Heuristics indicate it's a link farm on disposable hosting and that the PDF itself is a compromised CMS upload. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1430c2f44a---87700556365.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/95289497877.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ihplirq7sromc66i3053j3hcpj/nujadewofuriwepa.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/56285275457.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f0397bcaf35fd1ae9ae86b5562160a37/37597338113.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/fovimefimugu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/3231951457.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dolixanini.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/fibazaxeriniji.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/23273028845.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b889518924d---mitonegudodi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf636ac5bb---5427979409.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4c4l2893nmetsma4jniqieva92/remamijipevo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/51645005156.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/womevututabibuxe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/729a1b0df27f210f82e1930d6028c56c/9380792214.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/73bdf4470f223801f28bb163f963c195/peverasiki.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/5282773471.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec435b7511e---libisupuwaverewerizixaxu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/99127942585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=engineering+thermodynamics+by+pk+nag+4th+edition+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed805ca280---lixegibisusupofudiw.pdfIn PDF document text
    • 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_off00018f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9D 22964 bytes
SHA-256: 8de2186f32481719c56e4c763debc49636928b9a7cfb45a4835a23e72ab09ca8
font_01_sfnt_off0001cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC07 11560 bytes
SHA-256: 8df5371212305075696d5eb249a98b70df86cbb785043d4c0e35627553a11b8a
font_02_sfnt_off0001e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.