Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd338b285b036b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 03:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5389139b702d38feefc96fb20603d7c5 SHA-1: f33f9f6dcfc55bc37f35a8d9a5e737384eee2378 SHA-256: 25fd338b285b036b9471bf4b9bd96a4cb32f938dd2ed3391b272758e4a611373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple external websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/bujeligawupoxis.pdf In PDF document text
    • http://friulanapanini.com/images/file/59317787301.pdfIn PDF document text
    • http://dr-temt.ru/images/file/86246187475.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/17176935654.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5chce5g0k1qscg9bdo35d9hfok/64531675287.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/23510697639.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/masusifata.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/nekavumoxarom.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/piramozizujovixilupux.pdfIn PDF document text
    • http://lex.tj/img/file/rebipujovapivarizoxemuse.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/64269320423.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/fuzowi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613558aa03a5e---bibixexavilawe.pdfIn PDF document text
    • http://voijin.com/userfiles/files/13374496550.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/28871436702.pdfIn PDF document text
    • http://charivne.info/images/file/katilitozumeluleg.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/73932173589.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/razebiw.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/jurexatiduveworinolawetu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/mixaborakunekuzukap.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/susojoj.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/87920268503.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wetofetugulirig.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/puguvowafitanabo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f1c6931cfe06103377f1989fb6a8caec/foporuluvagenogoxel.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/je6t7e5p3oosfiqccatjm6tmbt/2282655276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+addons+maker+premiumPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 10920 bytes
SHA-256: 68467b7e10353c5ad71c4e9ae354ce9327c6e926987055e1c1c1b7f79a8fe152
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 17504 bytes
SHA-256: 6cfcfb0adb7db7717efedd493985671fca04e73aba75c74c74e9cde970370259
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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