Malicious PDF — malware analysis report

Static analysis result for SHA-256 adccd37583466839…

MALICIOUS

PDF

85.8 KB Created: 2021-08-10 12:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70eb4885102168982c278dce1c341288 SHA-1: 88efea431cb43f7c491e36f62740498ae6ee5a79 SHA-256: adccd375834668393237d48de78ee7c48b335b7c06d81cb1ce2cca822ac0cbc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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=interior+and+exterior+angles+of+polygons+maze+1+answer+key PDF link annotation
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/xupogikal.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/mezaxanezopilababu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/739d0f977314fb6c4d68eaa9a678686c/letaza.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/bosumezebodokelogibotad.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/gizilav.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/92954541106.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/39611655922.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bdea9cd2d---zoxeropajadixunexepofafel.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/342540faaa6c50f363f06bc263b2f2b7/lezosibikivedajefi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc5209987---vugezo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978dcea7d00---65310428971.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/65372847214.pdfIn PDF document text
    • https://ckmandarin.com/uploads/54447553979.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6059ee2d---jasatakubakezolakekazek.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c0e8393e---xuvufefixunega.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/pibirajuwegisupiluvuf.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/230b83baa9224c7487b4f81c49a88106/fugevibukoriragefavedav.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/95629695697.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/nukik.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0jlaqkj06k2enh5nao5emlvvh9/66883456429.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/47b5f1584888483570fe89634454085b/84086356547.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa1cac9bf---zezuzanitubowojiw.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4cuvs5jsduh1dhdqnc943e1r01/divewilejeno.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f3be416b---81228875661.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/garabitutibiv.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 17248 bytes
SHA-256: bf40ceaebfd2a2c5175e66dcfd2044caae8773666466f4a6d0d99931d394e573
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 11296 bytes
SHA-256: 95eb3b5ea7aff987b9834525a7eda9f4ef5812e433ff43cb0b82dd49c2547779

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