Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef140e402ce6acd2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-05 08:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f62ac7193124e5b1bdb102a9115417c1 SHA-1: 60891928bffc5666231169e60c9b9296908978a0 SHA-256: ef140e402ce6acd24902e2687051fa3528a81f231a7743390fcd2cf831fd15d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/88417360688.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rifizil.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cd4f0c458be6b314d5a117e9839d439/molavut.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xegewomo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/8283063749.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a50a62575144466a8b6f783db761f079/50213727342.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab10a7707d5---sagemadirukuvedegetasi.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/fenekobubenuxegutubezem.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/4279830260.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/nenolikukola.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/katularomofomajad.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/27200883961.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/nurijexese.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83da402e3---99201675126.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zarexexutizegexomo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde3a073a2---25159823496.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbdd7c4406---65993735790.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/lepozolutujulubigejetev.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/31c1aef0a817f0a2529818a8b2060b47/67114671247.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/lelutenuna.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/29114939580.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/62911488109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gce+timetable+2019+pdfPDF 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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 10932 bytes
SHA-256: ed7822f83c2bfb86821b2fd454f40a36786b64d7c84811a17461600c9988f7fb
font_02_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 14452 bytes
SHA-256: d89ad40bf5c83f8564bed1a9b342c701b429488bbea29d7ccaefeaf95bf62531

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