Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b854fd6bad57da3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 02:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cdb05566b37d9331388ccc4da54d3be SHA-1: 77ac98f257554ec97cb437c94d89e594953c083a SHA-256: 5b854fd6bad57da3d2f30b564788801a1acb752a76e5e8e56114789fee9cef52
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting other PDF files. This suggests a multi-stage attack, likely involving phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113f121c006a---detawopesegisudosebugaxol.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d618d2fdee3b5e0e236af651449fc0ea/8714579651.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/02ad9d526f1ba8821e49bf1ac4f52431/debavutozopa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612565e36e322---melolit.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/91029192631.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/kinugusegalefejizakenawum.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/13918392792.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/89865261583.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3ei7r6dussc2vme2ckh0fjll5b/4388076891.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/625749586.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wokasadubifune.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/64024660532.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/puzetufaxogesubuvu.pdfIn PDF document text
    • https://denimder.org/resimler/files/79421187424.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71bc7d525---dozamawevimokegidi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c969cb87b---19942635092.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/44097095765.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5bo5gt8geot309l6f1gq2ke4ug/80609782984.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/1059081507.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/73218615549.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ac4caf09e6fbeb4bf986a847ca7b98ca/63640626833.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefabivaxepinoripuwa.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/39853338049.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/gutukekobabenepug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=construct+2+manual+espa%C3%B1olPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 10900 bytes
SHA-256: 5b15812c5cc6141817403944858466630d2bad44ee882502b667f951cb906ac5
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 17772 bytes
SHA-256: f9fa3efc896d351abffef884d0a056c6db70e6b7fb3d416c43fbc485871cc6e2
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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