Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd8582a16fd56bb…

MALICIOUS

PDF

220.8 KB Created: 2021-09-03 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12e8b074b99e854c080dc0f607e7f785 SHA-1: 7f88c176bc6b1a678b79fcd1c62677b8f64fffb7 SHA-256: 4cd8582a16fd56bb5ff6e195087ef7c25c93f0ecb654a8c50d26c5435e855659
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF document contains a lure to execute commands via the clipboard, suggesting an attempt to trick the user into running a malicious payload. Several URLs point to compromised WordPress upload storage and other unknown PDF files, indicating a potential distribution or download mechanism. ClamAV detection and ML classification confirm the malicious nature of the file.

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.
  • 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://xtremefitksa.com/ckfinder/userfiles/files/pudiruwuzajewije.pdf In PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/nepiluvanujilipebikax.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/xolumuni.pdfIn PDF document text
    • https://digireg.lu/upload/90434071577.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-28/20210828154839215808.pdfIn PDF document text
    • http://chikatere.com/Upload/files/40794696763.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bae0137e2dd---77974112741.pdfIn PDF document text
    • http://www.bandungmesin.com/file/3103705421.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f7588734a---figowidexi.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/wefumuzojile.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/053a5b9c5d3fd925cc6e546588b94e37/mawirirekigovafukelawe.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/gamatadinomajadoli.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/16905823554.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5ef35ac3fa7651080e64842a3470b6b7/ruvisi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b39ecc02e52---44145543541.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/31343275863.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856747abe47---nazatedigi.pdfIn PDF document text
    • http://gibisch.biz/files/files/xemiwabodibofupawerozak.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5222ac5ee82050cde99b9c81b5758729/nukuxujilalewiwagafopobu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/gokepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+usuario+silhouette+cameo+en+espa%C3%B1olPDF 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_off0002f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00030e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E1E 10940 bytes
SHA-256: 9a075487a5583be2c790d7a60deecc0aabf43be0017111ffc7eca77184ca0def
font_02_sfnt_off000326fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326FE 23000 bytes
SHA-256: ce4969f4cc23beee66784da181e54a2258ae81f322472bb5654dd369f00bb9ce