Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3e5b08a9742e99…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 20:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24d800615a247b6f01e2eb80287e976a SHA-1: b701a8678e81c03ac65e9c526dc38565d5313a84 SHA-256: ce3e5b08a9742e994b3def2ef2f8ec4c311f3e6cfa8510aaa47a3d534e487753
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or phishing pages. The presence of external URIs and link farms suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wastran.ru/uplcv?utm_term=origin+of+the+universe+and+solar+system+pdf PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd178916e45---25000823035.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/m0525vqea8t30p5kh3mggj45p7/xiputomewudesoro.pdfIn PDF document text
    • https://linardi.ru/files/file/gonipubipijakuzejijonoga.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/63842979114.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/jeroxizikijuwosevu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad4e3ff1---batumigu.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/7b1ca2086df270ad6fdb3e6a70d6a608/97001390231.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/3a244385be87ebc1901e8fe8dd78e13f/38574622295.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ace55311452553b781fa0fdefada70fc/gitukixijojeromisi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/72223117986.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210627024352199.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/51955319085.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/modikemipigodawojiti.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/40935294066.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/33430535793.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9b67098f4ccd232b841e4dff64d13de3/5023424254.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/36548090181.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd46d292d---1907386971.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c76c8c2b2---69908941713.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083437af2bbb---vavix.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/kitaxipitumunojabijikesu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/48657821592.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/37af10d116d601147c1de00c2c8eccb4/xatiwujebanat.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/fadonuvafagegokexe.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/didufote.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a9a1fce9a4c7b24b409465af336648a/47135172976.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883244a92ad---poxojuputetilodulug.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_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 11248 bytes
SHA-256: b116727da4f8aac1f89087622a43359c5623eeb27f5153c5de6b65fc25e0e5af
font_02_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 17172 bytes
SHA-256: a16cc37de5cb1f934bf395a3faed15b0376695417c95b9002de32994a0de23e5

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