Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a68e2cf2822126…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 07:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bce8c977f906c69007e6bc968b25015 SHA-1: c1d1a5d0515459cdba8df1f651ea4716617b632c SHA-256: e7a68e2cf2822126e3469180384a11a0da0a602bff4e9acaa831800950d9148e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/80722b94f180acaaa61c9d7b419b3451/49091322138.pdf In PDF document text
    • https://sistemagestiondpr.co/userfiles/file/95306717823.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a86962d3c---67172684068.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/rejubivikadebunev.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/17e1d47c99c250fd97fa82d97eb84598/70791690058.pdfIn PDF document text
    • https://estoniapools.com/contents//files/gudod.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zerepewipujut.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630533410.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/15382427657.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/39562841911.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9ad27263a5682276a97e454d7e75e086/jagofibajizesamowodered.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3e11bbd30d220e28648ff4b33755dc53/davakexegonokiwopolejep.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/61788934757.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/64999631848.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb8a13f5f---wuwobikitoxososiwu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/16994654092.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db045ba34---minitejigexadikoje.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/52979536241.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/qspba9bkrugr0c1s3rinkc6fc2/ligezen.pdfIn PDF document text
    • https://cargotavio.ru/files/file/gupoladuj.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e89ad951246c970e9536fa0e6e7b1053/jinixabitemedivexeli.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071aeca18666---sozajifiwixitosivigurone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hec+ras+help+manualPDF 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_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 18784 bytes
SHA-256: b07923bc679f7aca8ef44e35cdd92013ea7c7f9c1b68df80ab29ca5d7fcbb072
font_02_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10420 bytes
SHA-256: 2af63483a0104b70a6fc412c5d1858aedeeb5a49f81d69f7bf8222dd1d2e74ce

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