Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2eab28e8e4b71…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 15:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cfc6839d6645b45ba5ccc82eaecb297 SHA-1: 6ce7c9a877eb2e82fe0b88c35dec385513809c01 SHA-256: f4b2eab28e8e4b7150f2c9d30e1020b831693f80e6c1bd24d0a6775a7f3bf02f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple disposable hosts, suggesting it's designed to redirect users to potentially malicious content or phishing sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://btsoft.vn/uploads/files/juwavotob.pdf In PDF document text
    • http://neteyes.eu/editor_up/62444750643.pdfIn PDF document text
    • http://ccadl.com/files/20210904222608.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613065629615f---nifogejoz.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jevoxilevevujuje.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/41808271066.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06cf97e5078fcf3e0c5d5f8c2a9b0917/tupexesapimotana.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wimigeparaxurigep.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xasavikikaru.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kofofanikoxabof.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/libameg.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/4737832324.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/13107569303.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/64089126536.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/penefof.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/70775739008.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/bapaluke.pdfIn PDF document text
    • https://topupdana.com/contents/files/rovokefibumabixivum.pdfIn PDF document text
    • https://profm.hu/files/file/60558999357.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/petazejozelalo.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/tonukegipujofujuripe.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/20220169269.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bfa19f860---gifudetajuzukubunolun.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/47794603465.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/tijumebasododejili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=medieval+castle+defense+methodsPDF 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_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 16404 bytes
SHA-256: 94becb99680b2e1dddf63b7105224fdee93465a51ac3be951881033359fbae3e
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10700 bytes
SHA-256: 509790d6e4f2f56f84fa968c8d0c4c06ab5bc65708a058ae9f1b5241ffa20ca9

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