Malicious PDF — malware analysis report

Static analysis result for SHA-256 568db48f8e5158fa…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 06:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 62de00dee699fbc275743c666a9498e3 SHA-1: 0fb515edae2015d337055f0e387196d8111b7b70 SHA-256: 568db48f8e5158fae9ff6ea86f5dde7562b68d7223e7672afd2ae5ed46376db7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deceive users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=the+strain+season+1+full+episodes PDF link annotation
    • http://leebyunghun.org/new/upload/board/files/43088228217.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/26695443352.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/196c14b2f59a299783058cdeda0372ba/48507650349.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jodabisumizi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/2340301788.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/wukawizukusugon.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/fejafigapekoxodefop.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/78651632361.pdfIn PDF document text
    • https://fond.ru/userfiles/file/77324964322.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/pejevefakikuzusetijiwi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/65013310149.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b052bfa40---53940678614.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/95460963609.pdfIn PDF document text
    • http://lukinserv.hu/file/3064603526.pdfIn PDF document text
    • http://lovesenergy.com/file/28817842477.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/93595605852.pdfIn PDF document text
    • http://bastola.org/userfiles/file/8850289733.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/susogedukubesekob.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613d278a873c9---57811174364.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/zusijamitapawomorun.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/62161329218.pdfIn PDF document text
    • http://lagrupacio.cat/file/powom.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/sipufetagus.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_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 17736 bytes
SHA-256: 8013b9c026b5d1e973b3305f5d9f675e7f8c070509c954199d9447d3646fa14a
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 10712 bytes
SHA-256: 544c203831d250f987e85a6b7e0bf6cde4fb3f71465583ffc2138e2aebed954b

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