Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c1962b6740ad82…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 01:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14e4874a895637247051abe6385ad898 SHA-1: fc9a0643c96805532e89ffe597073a1208607086 SHA-256: 70c1962b6740ad82266ef33abe3c0db84286ec8c8bbb9c01a52519099d1ffeff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to one of the numerous external URLs found in the document, which are hosted on compromised websites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=mastering+embedded+linux+programming+2nd+edition+pdf PDF link annotation
    • http://saigondome.com/uploads/userfiles/file/38108850121.pdfIn PDF document text
    • http://eko-uklid.com/files/file/44316007798.pdfIn PDF document text
    • http://bienbao.org/uploads/files/23120643195.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/60231079367.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607412e87b57a---zowuposef.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613103f5e9d73---15592099435.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fewuminitegupinubuzuro.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a008b8d6c7f---puvopavajifa.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ffea6c22---tazimif.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/92131273919.pdfIn PDF document text
    • http://npas.ru/pic/file/fitomedutixukaxegepez.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i32eoe3pbpcv51l999seb7u4h5/25243233499.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/d3a774vva5d1rkkofra41vli2r/kefasivud.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a6cd6cb97713d17de4c899a25e65e177/fagajeruluzajagemedekajib.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/povesutaje.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/getadakebiko.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ab07111a---84271595796.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9cb927ab---fotigubaniv.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/77605921005.pdfIn PDF document text
    • http://ipllaser.in/uploads/6356667907.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/407384686.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/9839545657.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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 11296 bytes
SHA-256: 060bcfd4d377477784e3049b99113f86023cd8aa3d6262e1124e990d13baa9f9
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 18436 bytes
SHA-256: bbd0067587aa821eb52826bba70ea4c4189004e134def0bcda005a8dd95039a1

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