Malicious PDF — malware analysis report

Static analysis result for SHA-256 057da3cbaf3c3625…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 07:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f3cfd1096abd575dedab6dfa0c93a69 SHA-1: 2ed4782a7d5f5f084f349ba8d8f6929ba59e1d46 SHA-256: 057da3cbaf3c362550398b568bff23d15944a0eb5b3a1f48cdd2a2d80e5f8431
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. It contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=cuentos+en+espa%C3%B1ol+para+ni%C3%B1os+pdf PDF link annotation
    • http://bmcnx.com/userfiles/file/99942336507.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9e411dd45d1e8f3641eb16b9509830e0/50283588899.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/xubiroroluga.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210805213007_l2m2pn.pdfIn PDF document text
    • http://daxitrip.com/basefile/daxitripcom/files/kuzasoredonitanajef.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/64734761820.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/kukadegesanipetesunana.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/78ac7808ec95f658b96c8d8655ff572a/5449496025.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896864d8378---baxusenukazupodusuf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb90f0b343---xijisalaxekuzozuju.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vusirarapupejasezepiminus.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612519d37681e---jemewozogawege.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f83b15f---97097972005.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210810070410.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/97287884759.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/wezaferevipaveferolep.pdfIn PDF document text
    • https://0900107678.com/upload/file/nixuninijulivelox.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/99096976856.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/anlhctp2s4vm7tft0g204c53eq/47596153405.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210804230826716.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/juloje.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/93163538522In 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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 10828 bytes
SHA-256: 57c999163b0e5cfdec2eb218e1d7bd7e1c8d44326cb75f088e5cc77cef8e6edb
font_01_sfnt_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 19632 bytes
SHA-256: f3875928a24ca4060e9b3825d7dc0ba330c347bc0c6d1eb215cd7a8323dfe369
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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