Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0c9df7c5e58c3f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 07:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f58db2b40f2b85fd660368dc02f7a3aa SHA-1: a2722a4101990badc8b82ae318a27b8268cf6752 SHA-256: fc0c9df7c5e58c3fa4641bf590ecbf561b3cc5a842ca7ec6ae2665def7275512
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains heuristics indicating it is a link farm and a lure for command execution, instructing users to copy/paste into a shell. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the 'SE_CLIPBOARD_COMMAND_LURE' heuristic points to a likely attack pattern of social engineering to execute arbitrary commands, potentially to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tungafilm.com/dorceiys/ckfinder/userfiles/files/30381099295.pdf In PDF document text
    • http://euromarkcreations.com/new/fck_img/file/32302815310.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a3b3c2e4---wititijexekolusetiwavejed.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/35994752385.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10214031299.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/fawibifuwawikiduk.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0d5acc3864ed39f34b4e9da94327188f/31187039231.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/89107435708.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/jigazofodelo.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402683a2f32---39835614276.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/85967924132.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210913214552.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/40862121169.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tovufedaj.pdfIn PDF document text
    • https://mauspro.net/upload/files/rasusumomizofed.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/gewuvebuwegizudoxulimok.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/19586842241.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d9a0430f917cfabb924cff17d25572b/jogosifafo.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/wolage.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/36361324589.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/fuxosewelud.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/81698396398.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/mukadibogelobajobezodinaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=install+android+emulator+on+ubuntuPDF 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_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 19344 bytes
SHA-256: 33e01dcee0189e86de5fe218e7e23024c77d66f6c1c5ca0153f89ed070ef9c81
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 10600 bytes
SHA-256: 502270de574e416700976e822506b1f324a3b217a37c110e68e2b99b3d9a15c0
font_02_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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