Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41c0363d37ae219…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 14:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b54a88a4435a17c1605528c2a6a679f6 SHA-1: 4c5c6b82a270ca5921d303ddb13647c752f035fa SHA-256: e41c0363d37ae2193b986f03cb9f5865e083bd00a0165e7684eedd72c925d035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=adb+driver+tool PDF link annotation
    • http://bigbulkbags.com/survey/userfiles/files/xiwirukovafur.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/55dgj8m5a12j8spm086q6k8da7/60505946744.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/bobizazodumosaz.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a979bde1feba59e777aebba8b4e8451e/10321363327.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/37696912963.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/joveg.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16133b95fd8e41---gojakagebixevitene.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zopiramapabigupexemegazo.pdfIn PDF document text
    • https://hgb.se/filer/file/kozazigemiwi.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/16604663964.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/sorurixumimoweriwi.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/49566668010.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/vuxuxanetawuxejaretim.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/28529477188.pdfIn PDF document text
    • http://creationart.hu/files/file/sobupovigarowezujewaw.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/nilul.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/40985398524.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/gutejobo.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/61386482367.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/sidegitepe.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/67077346962.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/sazupukikesovogox.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/85edd2b256c6b45b9934ab38719c684d/6009168008.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/sixusetegigakasikov.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/40345566435.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 9996 bytes
SHA-256: 87e5b14030fb9fca9665d8670f32975d562f584a47dec92d677048dc6b292563
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 19224 bytes
SHA-256: ac0fee7974174556771eadef9f1d6f0e7503f1546afc6fb6d58558cf5eafb730

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