Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceabdf8b736b2471…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 15:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c1540f4b8f1b94cb07efab997c575b7 SHA-1: 7b664edea227dddc5ec86ec3bd55811ae1dfcd5f SHA-256: ceabdf8b736b247103f8a71ca449e3036e81510be8f967de5a48554e3ca4d786
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a lure to execute commands via the clipboard. This is supported by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic firing. The document also contains numerous links to external PDF files hosted on various websites, some of which are associated with compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401e8c4823b---60953411312.pdf In PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lakakipelezasazetifaro.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613514258c9b4---tunisis.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/midomevexelagubudoki.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/11307179654.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • http://packamate.com/userfiles/73030847532.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1c3bb687---41480599905.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/ditokekana.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109140003106164.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48662734879.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/41269650367.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b532f69d81e3f92d7aa74d0b48fcbdd3/wovedetuxude.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/12137172120.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/75768360597.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/wulunabi.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/vivinituniz.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f61dd8eb9af2bd08408a567a921e32c1/23028872739.pdfIn PDF document text
    • http://umhouses.com/uploads/files/jigulukizoned.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/59289707436.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/gupewi.pdfIn PDF document text
    • https://tuinvandecruys.be/file/64104859345.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/91937847455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=screenshot+on+mobile+phonePDF 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 20020 bytes
SHA-256: ecf467b75ba213fc1956380d0393c885f89a82bed43bcd9703aff61c40ddf771
font_01_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD1 10692 bytes
SHA-256: 7bf7b1e7599df2b3c253617386f4657831c240f48603546a666d86ab651099dc

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