Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8ba7fc5c5d0b4d…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 20:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4194d29e28ff5831c163ae409e82d06a SHA-1: b470bace8593e571950d2a52261e4d10e2e3b423 SHA-256: ed8ba7fc5c5d0b4dfde001484ba036f9a3e796c94a85a3b98e31a3f5d5711c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c139e0d9---bagimil.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/388439a33cc48691f18bf7896c67f8f5/28280111211.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848a182d08e---519017745.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oeocektpsgjkrjbp6m8u5ktgbc/gofofunilefuzu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/jenifemedovevukogevet.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/41322087063.pdfIn PDF document text
    • http://ciskmv.com/css/file/82412992887.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/nufikodevukibilusova.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/gokikaboseden.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/pefiniwesoxuvujokis.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a71407b79ba---mijufaba.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6820f04a---somepepilazemote.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/fezutirudo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be9f84fb7---80334644532.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896112195ee---6836951556.pdfIn PDF document text
    • http://slsnn.ru/content/file/59792161388.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/26916183016.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993faaa22d2---zuduxiwozodelubefigefegiz.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375f4ebba---79034408134.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/nubixenaw.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03addad25---suniwejebofomuzofav.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/fa5225f56dbc65d3a6483c57e2d7e333/gixikugapajimumikowejuroz.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10b1e1511---ruzogowibiwuramoxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+copy+text+from+pdf+freePDF link annotation
    • 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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 17420 bytes
SHA-256: 31573b3fbe3524bc127d2b7a03e02e7f3b9f1d9810c01f9cbaa1f78958f469fd
font_01_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 10500 bytes
SHA-256: 438716c0f4cc786edbc4a0047988feb23552f876e6f846a56f5ec984d02532d3
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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