Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7b6c7d0ed9346a…

MALICIOUS

PDF

82.6 KB Created: 2021-08-14 22:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0099e98f0b1857e3b354f45c941d6e62 SHA-1: b460db440b51203f12b7eb5a05ae15e65c54d659 SHA-256: 5c7b6c7d0ed9346a6e5374ba64404d25ef635534ccac30c4e5dcdde039e49813
236 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a 'ClickFix' social engineering lure, instructing the user to copy and paste commands into a terminal, which is a common technique to bypass macro restrictions and execute a second-stage payload. The document also hosts numerous links to potentially compromised websites, suggesting a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://gymlesgeants.com/upload/editor/file/fituxapifulunamarikufivor.pdf In PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekatigipubemuverapudako.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/siwupuvitidokuzutakum.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/nunagikej.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/ludiwuxomademizag.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/37547200455.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/juvumesarabizegu.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/dobawirixakuseg.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/67023211016.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/derarumufib.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca0b7e099---54269967416.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d401113fcd---30742410316.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2314078354---10701330924.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/31679423395.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/kikotivilebarefo.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/651ba64f49b96e81d60a274c94de4d0a/91778845255.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/8772832267.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2de1a6529---91166606840.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/beganufu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608156e74cfa8---14841951031.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c56286c31f9---43655502623.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210614102152344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hkey_local_machine+software+policies+microsoft+windows+windowsupdate+au+wsusPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 17516 bytes
SHA-256: 5c52905e0116db7b8e0218563c8000c1bdcf3b5ea885ca19157f63c830f1f111
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 11300 bytes
SHA-256: bfda335c937321e82de5ad82dbed8a49d1ab99514186b24db1b34832beff4bd1
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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