Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea3cd390fce3272…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 00:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63cf069db3d02f703f83e7e84532bfe5 SHA-1: 28fed0a41420c6b1e70f2ae067055e2b66dabd5f SHA-256: 6ea3cd390fce3272edb32f6e7b16ac0dd5413184768ffbce807523c9ddbaddaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly suggest the PDF is intended to redirect users to malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=can+you+read+pdfs+on+kindle PDF link annotation
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/5234097692.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9aa0bd25---78815786969.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/lusegexom.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/zefonigevejanasobajeza.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/gukew.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/00e4llo7bre9kp7kmq6o83lvg4/wexakidugolokaxiguxi.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e4b68fc13db1cb86a04b6b158645375/taluwi.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gufos.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/39acaea3ddc921b098e050e4118f5cb6/63262300529.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kuveredowajidadejelu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609b180ebf837---kejonifa.pdfIn PDF document text
    • http://daydala.com/userfiles/file/sufosasufixamimumatokel.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/12122865104.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed3832181---xajixapigujazopetigefuli.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/rulol.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/0b9ce72d0bc7009cca41e08d4c574687/19962573610.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a395aca2fcf8ed06d66b5d18aa8257c1/lojetipekimemiz.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/neroz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16091f7e422455---11380124470.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/polenoruwelimofapiliwalu.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/lipatuwejevepis.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ivqu5hua2v6dad69mukcpc2ltr/wuvinupapo.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/55285208564.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/05e1f7269f817ac59d54d644d34f946f/bozileza.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16764 bytes
SHA-256: cff7d6f8cf6e8c3debd2d37f72308289480f646a1c199c1ef9b67d943ddcf3dc
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 10728 bytes
SHA-256: d3580bd6aa7015f89c11eadfbdddec611587f0b0282b51943f0714ebfff56a0a

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