Malicious PDF — malware analysis report

Static analysis result for SHA-256 0beb9659267d56b8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 08:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 156d7b05300f7cd78a454f2f8cbfaaf3 SHA-1: 33197980db3d2722b189ddd60c616b492a0c1545 SHA-256: 0beb9659267d56b824e6a311fa612a2b7d4640e953993d45bf5e53beed4dfa79
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mobilenmr.com/files/files/38853642574.pdf In PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/motiwixolunaxamikifolas.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wunazarukitoxosa.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tifopusuvonekasik.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/44669745969.pdfIn PDF document text
    • http://safetruck.gr/images/file/veruxepunorepevojodi.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/satopebok.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/beturiretal.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/25925125710.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132e688a50bc---nitogitow.pdfIn PDF document text
    • http://vipdiler.ru/files/file/88013715020.pdfIn PDF document text
    • https://carlojans.com/cms/file/wuzesamodevoje.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/9470951131.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/896e8a2852fa9d4b25d621737a87033d/41065687242.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/sakuzawunu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613236203464d---kadinafezuzorir.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/lejojuresaliwufozewowegu.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613105fc6fe6a---goxoriponezaxefemutewavap.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/99462821890.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/janamofilupekefugawikaba.pdfIn PDF document text
    • https://tuinvandecruys.be/file/77136067550.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/fixegefalimodozugajixin.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/zovewele.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/73725989303.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1gjqu9l953r20bd8ilu3av1vka/16008278073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=show+me+all+the+apps+on+my+phonePDF 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 10600 bytes
SHA-256: d68f5552d6b0565b5c384f993456ee1f34abff6d41ef0c14ce8260292ddd30ff
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 18100 bytes
SHA-256: a9ff97c301961f5c80940e874e8fc7ef51638b6c20dd1fcb510f395441ae2f09

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