Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3bbbf8f3c1472ad…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 029760df82a4c265ca6189594152b299 SHA-1: 7c7a1191cd12c386f5b43e246ad287ded01e0c8c SHA-256: e3bbbf8f3c1472ad8d543bb56e22221c30fdd81aa985f6b98ad58c62d863f827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=indian+snacks+recipes+pdf+download PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d13bb5377---nofasubu.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a9360a04---nufubivusuvorukomusitugu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344b9c982f---4320304369.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/a0hhgi69am2tbe6i6gebd1j8m0/13260536658.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/vudidevabogobinakameb.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/20437535367.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17fe5b55db---32921216428.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/wisosogifidebevi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857d93502a6---lejijuzazepisomozigaze.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9d5cc8db62f0a7dc6ad4a889ebb00ee7/32802297475.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tijamipedezoxinan.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/68025162701.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6ac4d948---672988710.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160893d7a9476f---nokamuxa.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/mikagakaxufaxev.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ej5dhru0qlhfua05jqnpvl8cm3/64152548996.pdfIn PDF document text
    • https://doganagolosa.it/file/wuluxiketup.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6051b1751---gedujonakedixeki.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/11712062482.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/i8u7s2064qo6clb4rv8974lne1/26804895316.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/sunosilakov.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160af0bfb5c9c3---xizaruwafijawu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d56b7e6131c09a1401a3c664bc914bec/sozopopuvidasez.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/156ccd7b039e3e79178f6901c900e5dd/89463088370.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b8c9a7ca480f69707bced1abd14eb403/22830308741.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_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 17608 bytes
SHA-256: df1aca5268be8aa72547219f3ff4aae242b7302978ef0f83c43dfe8e4c8e4015
font_01_sfnt_off00012b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B45 10644 bytes
SHA-256: 9d09277983b63b80f9b5257c0ac5b6e13e5447a1201a06d50562ffdeb6187ce9
font_02_sfnt_off000143cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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