Malicious PDF — malware analysis report

Static analysis result for SHA-256 4042a036fa74c5ee…

MALICIOUS

PDF

94.1 KB Created: 2021-09-17 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a7f8835e47060333547611ba1d6c85c SHA-1: 0354bf124e4a29463fbb8e9b528108781a96d768 SHA-256: 4042a036fa74c5ee7fb1b1a6d3e8f635f6c56f68fcf859d7ef9df55775b06ecd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. Several URLs point to potentially compromised WordPress sites, suggesting a distribution vector for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cauthinh.com/luutru/files/54763889395.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161357cf3621e6---kifutokajizirerojuxoseki.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/jewevum.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/gitedinuzerolises.pdfIn PDF document text
    • http://hflchw.com/upload/file/wakojuwakazadoveg.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/85901967673.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gezuxelijaki.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/xumovutewafejojarenopimot.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd145df34---95575866477.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sagub.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/xixej.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/komave.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/fizok.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/zanowujuvupopulilavogi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/35780513767.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/zofalilomapubo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa7bc7450---59241479230.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1e2447de---rudaxaliwabodalolubimemum.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/7693030201.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/ribilekunugi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/29833779094.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161412aae8cb24---61152829942.pdfIn PDF document text
    • http://zzquansu.cn/d/files/22180983658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+xchange+editor+macPDF 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_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 18476 bytes
SHA-256: 66fe704050727df5ed1f52a8b47bfff55b5e492f50492c2dc5e3885f113f859e
font_02_sfnt_off00015291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15291 10812 bytes
SHA-256: 224ad60f0be3657036cfa2eb632ef4cb5ed6c6a7f4f26c3694a53d4dc5795c02

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