Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eff1c8ed611d7c5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-15 17:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d7ffcee10f5ad411db4d0f97f11cdb8 SHA-1: e597650be99007e47facb5e6cfd71d8d38c718b9 SHA-256: 4eff1c8ed611d7c5da98e4d2a5153e54923d4862edea6405372a08a6f4a6e23b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=handspinners+and+weavers+guild PDF link annotation
    • https://unicorn.mn/js/ckfinder/userfiles/files/36612244545.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135337bcb568---73247661929.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/4455463962.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/notutajiworagok.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/tusazibikeke.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8100667d46bb1c4947afe1ffdd63a071/kabozubowonofipujodovu.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/40177899156.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sekarofamusilagavogik.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wevevojodi.pdfIn PDF document text
    • http://pi-consulting.ch/download/8035433708.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/23279062821.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/tibesokud.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/56585252917.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/nanupatopebaximuliz.pdfIn PDF document text
    • http://synowka.pl/galeria/file/28310918350.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/neferuxirezedef.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/41194624829.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/gelozoxi.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/mizumapozinosusadozavi.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/88718034155.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/81385576983.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/47139572496.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/38793111217.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135037803cd6---roginuwenesirekazur.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_off0000ccf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF4 18220 bytes
SHA-256: d5ec14b789d38ef701964ba73c50558081bd20afcfd85ac212f9b6d873522510
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10592 bytes
SHA-256: f501dd919a8acd9ae67f66b9cfe6126df480b97159357391b4046da14b72761c
font_02_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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