Malicious PDF — malware analysis report

Static analysis result for SHA-256 3347c6ac2bb1501a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4c0dffae1a7a8d9f015cc8b3e6e5571 SHA-1: d21215300e0c28a386f47bb3e6014e5ad818d3e5 SHA-256: 3347c6ac2bb1501a3769d5a5b5c0a0a2ddd75716d9b57832f11664294b9ff754
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. The document contains a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. Several URLs were extracted, some pointing to compromised CMS uploads and link farms, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiotecnicodavico.eu/userfiles/files/84057344727.pdf In PDF document text
    • https://yp05.com/_UploadFile/Images/file/bozabamusi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece77ad28c---92430092869.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/bawenurigegesupawugijej.pdfIn PDF document text
    • http://teifsepahan.com/files/file/82626023289.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/11614970674.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/60941657414.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/fasixamufelebore.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210910_E768C60E271C79FC.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/27285817034.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/pazametujotezugifej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c84c952e8---xepisowivikem.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9b3a2e7acdf1bc78a699f59821a603a9/kunovudivebizofazaj.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/30682825872.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mujarejitilawonedara.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/libimurafufagebuledesenir.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/jupogamu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613095efb202d---86795830524.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/13243426904.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sepuvob.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/mesuxapovuremegopezuziru.pdfIn PDF document text
    • http://skupka54.ru/upload/m/wanalonogozozagemoduje.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89137821325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+vm+for+linuxPDF 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_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 18428 bytes
SHA-256: 73ce0a6fa913a742972e08a7b718ce4788626c4d4a6f4d3c43c1ed8a1b109d1f
font_01_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 10204 bytes
SHA-256: 41b5ebd4dde74ba0f19e60be43f0c59002b83d58d7bf90a81f9ef3ac6949dcac

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