Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd062251376fffc…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 16:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 330a0261c1f787af60b729ca1122f661 SHA-1: 95855fe999b4076de30ca92d7a70dd734317dc7f SHA-256: 5cd062251376fffc3d75464aa259612a42100b8fcc32c9e85b10b5a5fe078ded
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique for downloading and executing secondary payloads. The document also hosts a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vabufulomurisivepa.pdf In PDF document text
    • http://getrade.net/uploadfiles/file/43070157951.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/3191176adfbe4e14214cc34f3f8bfc05/73658545122.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc570ee5f---50791206268.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/lijug.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/ragezibazenubuzi.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/5635193786137f052a6658.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91506226485.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/82803187352.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/6647842379.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sujijugutexuzolef.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/69368821644.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/tuvodowevesosemulo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/95545237787.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/35956139498.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf95b4dffe---84266133853.pdfIn PDF document text
    • https://km2804.com/ckupload/files/sisuxanedikaxikutofozej.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/55351798295.pdfIn PDF document text
    • https://venus-forever.com/image/files/saguwedilojogetiri.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/dolikekoz.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9n40l51ot07jap3o0vjjsgq7tj/68604665714.pdfIn PDF document text
    • http://packamate.com/userfiles/marezazido.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45380910896.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/69708384439.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/bexaxizulavid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+we+root+m2004j19c+devicePDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 19408 bytes
SHA-256: a3a2f6be3763347efe8aae12ddf4b0a8a876b3de65b96fd7d128d105bae13413
font_02_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 10864 bytes
SHA-256: 745a08c38d124ac30f2a28537d210457edde3607fc21a3748ad920b6addb9dad