Malicious PDF — malware analysis report

Static analysis result for SHA-256 9434a323711b6120…

MALICIOUS

PDF

83.6 KB Created: 2021-06-24 10:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f0dd71625937d8a094b99c8a2f912e4 SHA-1: 511b3fccb63c4bb138399bc53d806b2ea6e98dd4 SHA-256: 9434a323711b6120dd669d5a77cad0c62849983d9b3ce9a2a07560800301be4f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links to compromised websites, suggesting it is designed to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security features, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://laborke.ru/uplcv?utm_term=payday+2+pc+mod+menu PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3217fe21---25644854315.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/32387320124.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210502174755800780b9ch22.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a9d4250166550cdd633ab27f155f3c40/wonaxajekiwokanoxigifo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6d2e56f1c7104f190d881960160848f4/81603412446.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79828799280.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xokunovu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b732e304---kuvamigapejijepekivapar.pdfIn PDF document text
    • http://mwflower.com/upimagesfile/%5C/82675808542.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d19c4ed99f2---polexuforizozukukazavimek.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/nedipumexopekizef.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/11688525931.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563dd8edf2---lajewevuw.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bmp5upq499bum2pbk2d52nb0l3/panupepufapuliwixaxi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/568891e347cb085df935ed1e4715c3a0/dobizi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf06aa28b---tasotasajerawotifob.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/goginosenonun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 4904 bytes
SHA-256: a680f299e0a9ad3fbfb8873d26798c345e4342b05ebbd1487fc73f0b41bbd3c3
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 10444 bytes
SHA-256: fdbddf7cab07bf5736bc3d1d64336b95726ae56ed6dbad29cfbb75c318499590
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 16096 bytes
SHA-256: 43254c6337662e76ed67025008a42d76121bee43b935a85a5f582473253d5118
font_03_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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