Malicious PDF — malware analysis report

Static analysis result for SHA-256 092cd5e2c5f9b11f…

MALICIOUS

PDF

116.3 KB Created: 2021-09-16 21:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c472204a5466574fe70626725d99afa1 SHA-1: f248dd3876c851b7d4cfc812af36b74a93c0dbb3 SHA-256: 092cd5e2c5f9b11fb46625c0a7291d7b8a8b8b0c9bb02b07fba9298a8ab18e81
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are identified as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://addisonplaza.abwingsmd.com/uploads/files/kuzazapugexudipumijat.pdf
    • http://proxkimya.com/resimler/files/temikeg.pdf
    • https://millvalley.com/wysiwygfiles/file/nutif.pdf
    • https://stormester.no/files/file/61131325880.pdf
    • http://corkpotters.com/images/zitevijogoxegaru.pdf
    • http://cargologicru.com/sadm_files/86603585069.pdf
    • http://pro-group.ru/userfiles/file/46897290785.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138522685287---rururukodibig.pdf
    • http://bona-agra.pl/Upload/file/75279413558.pdf
    • http://ambartakip.net/belgeler/file/siwamefiwanajuguj.pdf
    • http://isystem.hu/userfiles/file/dazenawikipopipi.pdf
    • http://youzedu.com/ckimages/files/20210905223350557772.pdf
    • http://intelekt.biz/uploads/pages/files/dewezakegi.pdf
    • http://matchedtubes.de/userfiles/file/xekosubezole.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/mivezodetelusule.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/simonojaliponokadarono.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f3e67a6d---tuzebob.pdf
    • https://transdeliveris.lt/userfiles/file/zixujaseropobi.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/begeg.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1eb08128---14063339808.pdf
    • http://aftp.bg/userfiles/file/65071430563.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/16952471212.pdf
    • http://acril.ru/ufiles/files/kapivozalekizi.pdf
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/tuvakelupisemebaw.pdf
    • http://duhochoangthanh.com/upload/files/jizakupewizi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=new+boku+no+hero+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015596.bin
8ec5845a5df7b17e608ab1c0ed4a33f80db6e536a0a976ec98d0e61ef07616a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15596 10360 bytes
font_01_sfnt_off00016cce.bin
38fd899635261668fb9f5cd3878c0df9f8560306e2c5a0f6d65b00e2ccb3f7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCE 23656 bytes
font_02_sfnt_off0001ab6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB6D 16792 bytes

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