Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d32eb821f3d1fb4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-11 12:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ceb518823ee9bbd2857398bb4bb666aa SHA-1: 86f706daa61ce1b088314d78844a772832411339 SHA-256: 5d32eb821f3d1fb4faa99842aae2f793298d2f965f4cf0e5c14bbf9dc772e4fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure users into potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=hacked+clash+of+clans+for+ios PDF link annotation
    • http://zeci.nl/im/image/nutebibejolamomo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/tasoginis.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/sisarakopitufavizuw.pdfIn PDF document text
    • http://apothepharma.com/upload/files/pikidefutag.pdfIn PDF document text
    • https://phnews.ro/files/file/55405513255.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/pivomidapirojafug.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ij3m38eijmtsm6vej35tiv8b70/58934190149.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/60883d93e3152c7a51ba53e4bd414bf7/55492529211.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/lozizujegixiko.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/ripurojizudipajegol.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/10921333086.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/vogakonewajuwowuwelemod.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/kagenetovuju.pdfIn PDF document text
    • http://zl369.net/userfiles/file/kefok.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/7581807684.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51862966327.pdfIn PDF document text
    • http://alkanboya.com/files/file///43755223509.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/16957905553.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/xevega.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613acc93a8880---51773893405.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/28c9abaa8b92f0f23928ef82ea63fcce/vukeriwenoxogelifibeg.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210909201055431.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/94039322641.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c5e0f459fc51517d4eff35748c317f1c/fugatiwimoxapagine.pdfIn PDF document text
    • 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_off0000b580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD92 15716 bytes
SHA-256: 20143298479de4d71e488b07cb249e2deeb4fc2b1d2cc6ff6cd89a45c334b1ef
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10560 bytes
SHA-256: 0203c1eed498ec4cc70a91f0a957412767fb71994c5367f08fcdb4bab568f4c3

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