Malicious PDF — malware analysis report

Static analysis result for SHA-256 024c0612cd46b9e8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 17:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a22daf3d0335060e3d96785f5b356dd SHA-1: 76eb0e61bfb0dd95797cec0eb5623e9c35b8067f SHA-256: 024c0612cd46b9e899c63f4650787de9fb929a1b60b805c5fe7e776952624cf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=double+negative+worksheet+1+brave+knights+answers PDF link annotation
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253064977---39048764149.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fudajamajitukixiruzujajen.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/zutisajurusuwen.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/20925786963.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3m31kqlkeshk8ast0bfgi5fg3d/39812561385.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90666748705.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/40580422932.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6db70fc825f6ce003912f2747d3c242c/2752062775.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xuzusogi.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/bowuzezesezomixexagaguw.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/60bb8c94401fda3c0c4ae0fdc578f351/72522550884.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1e0185b577230ce28a51cb098aae897f/78700730457.pdfIn PDF document text
    • https://seikai.jp/free_images/files/84308963509.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/temoxibowefudesifijevuv.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b3a5b3d5---tidalekimepuxozofase.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/varuvozado.pdfIn PDF document text
    • http://coumert.com/images/file/gonafokozu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1705f47e83---3929690371.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/27731635694.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/88508795348.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4a153d24d---tipinabarifetiwubobizarun.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/75386692070.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_off0000f29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 17240 bytes
SHA-256: 22e283c815fff8b1e053a9da3de431d556b8a96cbf6334cfacfebe23d0700560
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 10924 bytes
SHA-256: 85e6654d54201e5abfdcf36c80ec984568f0f00edb739db5f269e3eb704d34c1

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