Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f2e20f8ccf45b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 15:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2df62909c1024d4cc102f146a7469d39 SHA-1: a1bf9fcb83bc8f62e932bcf21202a7998e8b5c5f SHA-256: 0b1f2e20f8ccf45bc39d2e8cec5d59fbe96fedb66423cfc6d99f3949f9486355
164 Risk Score

Malware Insights

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

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content, such as phishing pages or additional malware payloads. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081487b4aa28---taworodapi.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a94d98344---56049719483.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/nogokiviwopupites.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wolivu.pdfIn PDF document text
    • http://topp.pl/_topp/file/13633856933.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/febuquopdeiqutilr7aa3ntm6c/lisegowulufujewaxiju.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/50528576929.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0159976642---94371347501.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429165651693053.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d48e15d2fc9---69978290436.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/wipukakoxukisatovulet.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f093c710fa2e80f412695b85b1daf371/losejebelixabasijodivig.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/genaragoferumeludewubob.pdfIn PDF document text
    • https://partnermind.cz/images/files/deduzejupuxuximek.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/musebiterosunusoso.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160821351bb4fd---xojukajarusin.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5231f2ed91---setavi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9f4c0e5bc4ccfce76403cd6886c678f8/vatirilageretutala.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/93356365947.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/vituvilageruligalomomumo.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/47975440755.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/71229910970.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/bumavonovadojabiburimaput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=convertire+pdf+in+word+freePDF 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 18184 bytes
SHA-256: 96ec05627ee300023a9aacac4d7c50997fc2a3a2e3658fedae173da49d53a4f4
font_02_sfnt_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10300 bytes
SHA-256: 474afc75dbeee681c1f0cdf17cb220b288491b2126b6b3daa3f60f3bc9b922cb

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