Malicious PDF — malware analysis report

Static analysis result for SHA-256 2defed3360623068…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 06:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7bd1482dc8721f3d68c1c2816f743fc8 SHA-1: d6900ff609bb93d2c43bedc1703da15022f8f3fe SHA-256: 2defed3360623068e7eb65d4ac6d847e40c2b708bbeb6b4915264eb379471834
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://123natura.com/stockages/files/43566627008.pdf In PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/buvapozew.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///xotuvifud.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/nukevovik.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nabete.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/56142171989.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e18fde45e---rimivesasabomesuzuvezed.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/89638471709.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/semademut.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/92891618118.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8a54ea72---medetepeg.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jazerutaxizoxapotodor.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-8-15/20210815091658107997.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2jufmd4bmkf5o8hcasnvul9h1h/xolinidujobiloga.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160979eaa4e5ba---fanulofomeb.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/71772560624.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ed5e4a7156bab9e9a2a76d96715534cc/sojejanitofilonomagober.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/rukimezaxofogizelakinew.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/mekukudilowamesaderemipez.pdfIn PDF document text
    • https://wagaskar.com/media/nivokepigaxawabofokovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=advanced+industrial+control+technology+pdfPDF 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_off0000b1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E8 11160 bytes
SHA-256: 5f2fc0362179c5ca38439a04856f16eeaf889fa900bf13649688ce505a4d680b
font_01_sfnt_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 16896 bytes
SHA-256: d15c15875758460cf3bf5d70e7668921cafc8c4565869c06e484d0549f8718c1

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